Category: Science
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PSLE Science Reality Lab Vol No.252 | “Cpk = 1.33” — Does One Number Guarantee Every Product Meets the Limits?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on Cpk: why a process-capability index compares a stable process distribution with specification limits but does not act as a percentage quality score or guarantee that every product passes.
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PSLE Science Reality Lab Vol No.251 | “2-Hour Fire-Resistance Rating” — Will the Assembly Always Last Two Hours in a Real Fire?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on fire-resistance ratings: why a 2-hour rating is a standard-test result for a defined assembly and not a universal stopwatch guarantee for every real fire.
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PSLE Science Reality Lab Vol No.250 | “Air Sensor Says PM2.5 = 40” — Is That the Same as a Regulatory Monitor Reading?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on air-sensor evidence: why a compact PM2.5 sensor can be scientifically useful without being automatically equivalent to a regulatory reference monitor, and how location, time, humidity, correction and performance testing change what the reading can support.
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PSLE Science Reality Lab Vol No.249 | “Correlation r = 0.80” — Does That Prove One Variable Causes the Other?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on correlation claims: why r = 0.80 can show a strong linear association without proving causation, 80% accuracy or one causal direction, and what additional evidence can strengthen a causal explanation.
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PSLE Science Reality Lab Vol No.248 | “The Scale Shows 12.34 g” — Is the Mass Accurate to the Nearest 0.01 g?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on digital scale readings: why 0.01 g display steps do not automatically mean ±0.01 g accuracy, and how readability, repeatability, reference checks and measurement conditions change what the digits can support.
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PSLE Science Reality Lab Vol No.247 | “Climate Normal = 30°C” — Is 30°C What the Weather Is Supposed to Be Every Day?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on climate normals: why a long-term normal is a reference baseline rather than a daily forecast or required value, and how base periods, variation and anomalies change what a climate graphic can support.
