Category: Science

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A Primary 5/6 PSLE Science Reality Lab guide to timestamp alignment: learn why two datasets that both say 12:00 may describe observations hours apart unless their time zones or UTC offsets are matched.

PSLE Science Reality Lab Vol No.113 | “The Sample Was Diluted Tenfold Before Testing” — Did the Reporting Limit Change for the Original Sample?

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A Primary 5/6 PSLE Science Reality Lab guide to diluted samples: learn why a result measured after tenfold dilution may need to be interpreted on the original-sample basis, and why dilution can also change the effective reporting limit.

PSLE Science Reality Lab Vol No.112 | “Estimated Result: 3.2” — Is That the Same Kind of Number as an Ordinary 3.2?

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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.

PSLE Science Reality Lab Vol No.111 | “The Test Reports Down to 10, but the Claim Needs Below 5” — Can This Method Prove It?

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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.

PSLE Science Reality Lab Vol No.110 | “Method Validated” — Validated for This Sample, Range and Purpose?

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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.

PSLE Science Reality Lab Vol No.109 | “Spike Recovery = 95%” — Does That Mean 95% of the Substance Was Removed?

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