Science Scientific Inquiry Conceptual 11–12 yrs

Repeated tests for reliability

重复测试以确保可靠性

Description

Distinguish between precision (consistency of repeated readings) and accuracy (closeness to true value), use significant figures and standard form correctly, and choose and use appropriate measuring instruments to minimise uncertainty

Mastery Evidence

✓ Explains the distinction between precision and accuracy with examples
✓ Rounds measurements to an appropriate number of significant figures
✓ Selects a measuring instrument with appropriate resolution for the context (e.g. choosing a 10 ml measuring cylinder rather than a 1-litre measuring jug for a 5 ml measurement)

Assessment Prompt

If your child weighed the same stone five times and got very similar answers but they were all slightly too high, could they explain the difference between being precise and being accurate — and why having lots of repeats doesn’t always fix the problem?