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## AP®︎/College Statistics

### Unit 10: Lesson 8

Confidence intervals for the difference of two proportions

# Conditions for inference on two proportions

AP.STATS: UNC‑4 (EU), UNC‑4.J (LO), UNC‑4.J.1 (EK)

## Problem

A school district is considering a change that would involve switching the daily start times for its elementary and high schools. Administration wants to take a sample of parents from each type of school and perform a two-sample z test to see if the proportion who support the change is significantly different between the two groups.
Which of the following are conditions for this type of test?