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AP®︎/College Statistics

Course: 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)

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?

(Choice A)
The expected counts of parents who support the change and do not support the change are all at least 10 in both samples.
(Choice B)
The parents from each school are chosen randomly.
(Choice C)
Parents in each sample can be considered independent, and the samples themselves are independent.

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AP®︎/College Statistics

Course: AP®︎/College Statistics > Unit 10

Problem