LEARN · EXPLAIN · REVISE

A population has 100k students and a simple random sample has 10k. Find each student’s inclusion probability.

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 / Foundation#Your turn

k=7

Skills and prerequisite lessons

Working and explanation

BUILD THE REASONING

Hint 1

Identify the population and sampling mechanism before scaling counts.

Hint 2

All students must have the same chance under simple random sampling.

Worked solution

The requested value is 0.1.

Checks and common pitfalls: This is inclusion probability, not the fraction who will answer a survey.

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

Teacher preparation and assessment