LEARN · EXPLAIN · REVISE

Survey responses 5k contain 2k reports in seconds although the question asked minutes. Is direct pooling valid?

Read the idea, work independently, then explain what changed.

TOPIC 01

Statistics: mixed assessment

A mixed assessment: identify the method, justify it and revise your reasoning.

Use one hint at a time. A correction explains what changed, not just the final answer.

01 / Standard#Your turn

k=10

Skills and prerequisite lessons

Working and explanation

BUILD THE REASONING

Hint 1

State the survey question, population, sampling and measurement rules before drawing a conclusion.

Hint 2

Check definitions and units before summary statistics.

Worked solution

State the survey question, population, sampling and measurement rules before drawing a conclusion.
Calculate or simplify this relation.
$1\text{ minute}=60\text{ seconds}$
Cleaning decisions should remain documented, not silently delete difficult cases.

No. Convert compatible units and flag ambiguous responses before analysis.

Checks and common pitfalls: Cleaning decisions should remain documented, not silently delete difficult cases.

Reasoning checklist · self / teacher assessment

Think first. Reveal a hint when the class is ready.

Teacher preparation and assessment