Category: PSLE Primary Science
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PSLE Science Reality Lab Vol No.540 | “Pixel Value = 12,000 DN” — Is That Already a Physical Reflectance Measurement?
A massive Primary 5/6 PSLE Science evidence guide to satellite digital numbers: why a stored DN is not automatically a physical reflectance measurement, and how metadata, scaling and quality flags control the claim.
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PSLE Science Reality Lab Vol No.538 | “Absorbance = 2.0” — Did the Sample Absorb Twice as Much Light as Absorbance = 1.0?
A massive Primary 5/6 evidence guide to absorbance and transmittance: why absorbance 2.0 is not simply twice the percent light absorbed as absorbance 1.0.
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PSLE Science Reality Lab Vol No.537 | “This Museum Dinosaur Is One Skeleton” — Did Every Display Bone Come From One Animal?
A massive Primary 5/6 evidence guide to museum dinosaur mounts: how to separate original fossil, cast, reconstruction and composite evidence before claiming one complete animal was found.
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PSLE Science Reality Lab Vol No.536 | “Least Concern” — Does That Mean a Species Has No Conservation Problems?
A massive Primary 5/6 evidence guide to IUCN Least Concern: why a global extinction-risk category does not mean no local decline, no threats or no conservation need.
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PSLE Science Reality Lab Vol No.535 | “AUC = 0.90” — Is the Classifier 90% Accurate?
A massive Primary 5/6 evidence guide to ROC AUC: why AUC = 0.90 is not automatically 90% accuracy, and how thresholds, test data, errors and independent validation change the claim.
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PSLE Science Reality Lab Vol No.539 | “Result: R — Rejected” — Does That Mean the Substance Was Not There?
A massive Primary 5/6 PSLE Science evidence guide to rejected laboratory data: why an unusable result is not a measured zero, a valid non-detect, or proof that a substance was absent.
