Category: PSLE Primary Science
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PSLE Science Reality Lab Vol No.534 | “Six Check Results Keep Rising but Stay Inside the Limits” — Can We Ignore the Trend?
A Primary 5/6 evidence guide to scientific control charts: why a sustained trend inside the limits can still signal a changing measurement process and deserves investigation.
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PSLE Science Reality Lab Vol No.533 | “Proficiency-Test z-Score = 0.2” — Is the Laboratory 99.8% Accurate?
A Primary 5/6 evidence guide to laboratory proficiency-test z-scores: why z = 0.2 is a standardised comparison, not 0.2% error or 99.8% accuracy.
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PSLE Science Reality Lab Vol No.532 | “Water-Quality Geometric Mean = 40” — Were Most Samples About 40?
A Primary 5/6 evidence guide to geometric means in environmental reports: why one summary value does not show what most samples were, the maximum, or the full spread.
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PSLE Science Reality Lab Vol No.531 | “The Radar Map Is Blank in This Wedge” — Does That Mean No Rain Fell There?
A Primary 5/6 evidence guide to blank weather-radar sectors: why a missing or weak echo may reflect beam blockage, coverage or attenuation rather than proof that no rain fell.
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PSLE Science Reality Lab Vol No.528 | “Slope = 100%” — Does 100% Mean a Vertical Cliff?
A Primary 5/6 evidence guide to percent-slope labels: why 100% slope means equal rise and horizontal run, not a vertical cliff or a generic “maximum steepness” score.
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PSLE Science Reality Lab Vol No.527 | “The Change Map Shows a Red Edge” — Did the Ground Really Change, or Were the Images Slightly Misaligned?
A Primary 5/6 evidence guide to scientific change maps: how tiny image misalignment can create false red-and-blue edges that look like real physical change.
