LEARN · EXPLAIN · REVISE

In a sample of 20k, 5k use public transport. Estimate the population proportion.

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=9

Skills and prerequisite lessons

Working and explanation

BUILD THE REASONING

Hint 1

Translate counts into sample proportions and keep classes, units and uncertainty visible.

Hint 2

Use the observed fraction as an estimate.

Worked solution

Translate counts into sample proportions and keep classes, units and uncertainty visible.
Calculate or simplify this relation.
$\hat p=45/180=0.25$
The population proportion is estimated rather than known exactly.

The requested value is 0.25.

Checks and common pitfalls: The population proportion is estimated rather than known exactly.

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

Teacher preparation and assessment