G2 Science Data Ownership | Learner’s Guide Vol 0075

G2 Science K223, K224 and K225 data questions often become difficult not because the learner cannot read a number, but because the number loses its owner. A value belongs to a condition, instrument, time, sample, variable and unit. This seventy-fifth Learner’s Guide develops data ownership: attach every measurement to the exact experimental state that produced it before comparing, calculating or concluding.

This is distinct from Vol 0061 Claim–Evidence Mapping and Vol 0071 Competing Mechanisms. Those chapters ask what evidence supports and which mechanism explains. This one asks the prior question: whose evidence is it?

The ownership label

Before using a value, be able to label it as condition → variable → time/sample → unit. For example: heated sample → temperature → 4 minutes → °C. Ownership prevents a correct value from being compared with the wrong condition or used to support the wrong claim.

1. which row belongs to the control condition

When deciding which row belongs to the control condition, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

For practice, deliberately swap two labels while keeping the numerical values unchanged. Ask how the conclusion changes and which check exposes the swap. Then restore the correct ownership and write the smallest valid claim. This trains the learner to see labels, keys and conditions as part of the evidence rather than decoration around the data.

2. which column is the manipulated variable

When deciding which column is the manipulated variable, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

3. which reading is the dependent variable

When deciding which reading is the dependent variable, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

4. which unit belongs to each measurement

When deciding which unit belongs to each measurement, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

5. which time point belongs to each sample

When deciding which time point belongs to each sample, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

6. which graph line belongs to each treatment

When deciding which graph line belongs to each treatment, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

7. which key symbol belongs to each dataset

When deciding which key symbol belongs to each dataset, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

8. which repeat belongs to the same condition

When deciding which repeat belongs to the same condition, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

9. which mean belongs to which group

When deciding which mean belongs to which group, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

10. which anomaly belongs to which trial

When deciding which anomaly belongs to which trial, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

11. which instrument produced which reading

When deciding which instrument produced which reading, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

12. which calibration applies to which instrument

When deciding which calibration applies to which instrument, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

13. which observation belongs before the intervention

When deciding which observation belongs before the intervention, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

14. which observation belongs after the intervention

When deciding which observation belongs after the intervention, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

15. which result belongs to the control

When deciding which result belongs to the control, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

16. which result belongs to the experimental condition

When deciding which result belongs to the experimental condition, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

17. which sample received the reagent

When deciding which sample received the reagent, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

18. which sample did not receive the reagent

When deciding which sample did not receive the reagent, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

19. which temperature belongs to which reaction

When deciding which temperature belongs to which reaction, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

20. which concentration belongs to which rate

When deciding which concentration belongs to which rate, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

21. which mass belongs to which volume

When deciding which mass belongs to which volume, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

22. which force belongs to which object

When deciding which force belongs to which object, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

23. which acceleration belongs to which force condition

When deciding which acceleration belongs to which force condition, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

24. which current belongs to which resistance

When deciding which current belongs to which resistance, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

25. which voltage belongs to which circuit

When deciding which voltage belongs to which circuit, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

26. which distance belongs to which time interval

When deciding which distance belongs to which time interval, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

27. which energy input belongs to which output

When deciding which energy input belongs to which output, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

28. which temperature change belongs to which material

When deciding which temperature change belongs to which material, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

29. which precipitate belongs to which test

When deciding which precipitate belongs to which test, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

30. which gas observation belongs to which reagent

When deciding which gas observation belongs to which reagent, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

31. which pH belongs before and after addition

When deciding which pH belongs before and after addition, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

32. which product amount belongs to which reactant condition

When deciding which product amount belongs to which reactant condition, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

33. which enzyme activity belongs to which temperature

When deciding which enzyme activity belongs to which temperature, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

34. which photosynthesis rate belongs to which light level

When deciding which photosynthesis rate belongs to which light level, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

35. which breathing rate belongs to rest or exercise

When deciding which breathing rate belongs to rest or exercise, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

36. which population count belongs to which habitat

When deciding which population count belongs to which habitat, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

37. which organism belongs to which environmental condition

When deciding which organism belongs to which environmental condition, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

38. which sample size belongs to which percentage

When deciding which sample size belongs to which percentage, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

39. which raw count belongs to which proportion

When deciding which raw count belongs to which proportion, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

40. which graph is raw data and which is transformed

When deciding which graph is raw data and which is transformed, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

41. which point is measured and which is predicted

When deciding which point is measured and which is predicted, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

42. which value is model output and which is experimental data

When deciding which value is model output and which is experimental data, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

43. which result is direct measurement and which is proxy evidence

When deciding which result is direct measurement and which is proxy evidence, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

44. which conclusion belongs to which dataset

When deciding which conclusion belongs to which dataset, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

45. which cause claim belongs to which controlled comparison

When deciding which cause claim belongs to which controlled comparison, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

46. which limitation belongs to which method

When deciding which limitation belongs to which method, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

47. which improvement repairs which limitation

When deciding which improvement repairs which limitation, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

48. which source of error affects which measurement

When deciding which source of error affects which measurement, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

49. which uncertainty applies to which instrument

When deciding which uncertainty applies to which instrument, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

50. which missing value is truly missing rather than zero

When deciding which missing value is truly missing rather than zero, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

51. which zero is a measured result

When deciding which zero is a measured result, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

52. which data range supports the interpolation

When deciding which data range supports the interpolation, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

53. which prediction lies outside the measured range

When deciding which prediction lies outside the measured range, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

54. which repeated dataset supports repeatability

When deciding which repeated dataset supports repeatability, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

55. which independent dataset supports replication

When deciding which independent dataset supports replication, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

56. which result belongs to Physics, Chemistry or Biology

When deciding which result belongs to Physics, Chemistry or Biology, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

57. which MCQ evidence belongs to which option

When deciding which MCQ evidence belongs to which option, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

58. which structured-response evidence belongs to which claim

When deciding which structured-response evidence belongs to which claim, reconstruct the ownership chain before interpreting the number. Identify the experimental condition, the variable actually measured, the relevant time or sample, and the unit. Do not allow proximity in a table or graph to substitute for ownership. A correct reading attached to the wrong condition produces a scientifically incorrect comparison.

Ownership before comparison

A comparison is valid only after both values have secure ownership and comparable meaning. Two readings can look similar while belonging to different instruments, times or denominators. Two graph lines can cross while representing different conditions. Establish ownership first, then decide whether subtraction, ratio, trend or causal comparison is scientifically justified.

Links

Use the Science Hub for underlying Physics, Chemistry and Biology, Vol 0072 for independent checking, Vol 0065 for causal testing, the Examination Craft hub for timed control and the PSLE Learner’s Guide for earlier evidence foundations.

Official-source discipline

The official 2027 G2 Science syllabus covers K223 Physics/Chemistry, K224 Physics/Biology and K225 Chemistry/Biology and assesses handling information, solving problems and experimental reasoning. Use the current SEAB G2 syllabus directory and linked Science syllabus for current requirements.

Final rule

A number without ownership is not yet usable evidence. Attach condition, variable, time or sample and unit before comparing it. Once ownership is secure, patterns and mechanisms become much harder to misread.

Small Group Tutorials

How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0075 | Science: Data Ownership — Attach Every Measurement to the Condition That Produced It