Category: Science
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PSLE Science Reality Lab Vol No.112 | “Estimated Result: 3.2” — Is That the Same Kind of Number as an Ordinary 3.2?
A Primary 5/6 PSLE Science Reality Lab guide to qualified or estimated scientific values: learn why an estimated 3.2 can still be useful evidence, but should not be read as though it has the same certainty as an ordinary quantified 3.2.
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PSLE Science Reality Lab Vol No.111 | “The Test Reports Down to 10, but the Claim Needs Below 5” — Can This Method Prove It?
A Primary 5/6 PSLE Science Reality Lab guide to reporting limits and decision thresholds: learn why a test that can only report reliably down to 10 cannot automatically prove a claim that requires below 5.
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PSLE Science Reality Lab Vol No.110 | “Method Validated” — Validated for This Sample, Range and Purpose?
A Primary 5/6 PSLE Science Reality Lab guide to “method validated” claims: learn why validation has a scope—sample type, target, range, conditions and intended purpose—and why a valid method is not automatically valid everywhere.
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PSLE Science Reality Lab Vol No.109 | “Spike Recovery = 95%” — Does That Mean 95% of the Substance Was Removed?
A Primary 5/6 PSLE Science Reality Lab guide to spike recovery: learn why recovering 95% of a known added amount is a quality-control result, not evidence that 95% of the original substance was removed.
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PSLE Science Reality Lab Vol No.108 | “The Duplicate Samples Disagreed” — Should We Average Them and Move On?
A Primary 5/6 PSLE Science Reality Lab guide to duplicate and replicate disagreement: learn why two differing results are evidence about variability or method performance, not numbers to hide inside an average.
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PSLE Science Reality Lab Vol No.107 | “QA/QC Passed” — Does That Mean Every Result Is Correct?
A Primary 5/6 PSLE Science Reality Lab guide to QA/QC claims: learn what blanks, replicates, spikes and other quality checks can support—and why “passed” does not mean every scientific result is perfect.
