Category: Science
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PSLE Science Reality Lab Vol No.130 | “Below the Detection Limit” — Is It Scientific to Enter Zero Before Calculating the Average?
A Primary 5/6 PSLE Science Reality Lab guide to non-detects: learn why “below the detection limit” is not automatically zero, and how replacing non-detects with zero can change an average, graph or scientific claim.
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PSLE Science Reality Lab Vol No.129 | “AQI Doubled From 50 to 100” — Did the Pollution Double?
A Primary 5/6 PSLE Science Reality Lab guide to scientific indices: learn why a change in AQI is not automatically the same proportional change in pollutant concentration and how to read the underlying scale, pollutant and breakpoints.
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PSLE Science Reality Lab Vol No.128 | “The Study Was Retracted” — Does That Prove the Opposite Claim Is True?
A Primary 5/6 PSLE Science Reality Lab guide to retracted studies: learn how to check why a paper was retracted, what evidence becomes unreliable, and why retraction does not automatically prove the opposite scientific claim.
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PSLE Science Reality Lab Vol No.127 | “>100” — Does That Mean the Result Is Exactly 100?
A Primary 5/6 PSLE Science Reality Lab guide to right-censored scientific results: learn why “>100” means the value is above a reporting boundary, not exactly 100, and how that changes comparisons and conclusions.
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PSLE Science Reality Lab Vol No.126 | “The Reading Is Inside the Limit” — Does Measurement Uncertainty Still Matter?
A Primary 5/6 PSLE Science Reality Lab guide to pass/fail claims near a limit: separate the measured value, measurement uncertainty, specification and decision rule before deciding what the evidence supports.
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PSLE Science Reality Lab Vol No.125 | “95% Confidence Interval” — Does That Mean 95% of the Individual Results Must Fall Inside It?
A Primary 5/6 PSLE Science Reality Lab guide to confidence intervals: learn why a 95% confidence interval estimates an unknown population quantity rather than containing 95% of individual observations.
