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Course: AP®︎/College Statistics>Unit 10

Lesson 4: Setting up a test for a population proportion

Conditions for a z test about a proportion

Examples showing how to check whether or not the conditions have been met for doing a z test about a proportion.

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• In my stats class we were taught that in order to be normal the pn and qn had to be greater than or equal to 5. Which way is standard?
• Where did these three conditions initially introduced and explained in this series of video?
I went through the list of content covered under "Statistics and probability" topics, but I couldn't find any. Could anyone send a link please?
• Is it a rule that np,n(1-p)>=10? [For the normal condition to be true]
• When the p-value is being elaborated on, shouldn't it be the population statistic being less or equal the one we calculated for the sample? I guess we are trying to make assumptions about all of the workers?
• Firstly, to clarify, it's called 'statistic' for samples, but 'parameter' for a population.

Secondly, p-value is the probability that a sample statistic will be at least as extreme as the sample statistic we actually measured, on the condition that our null hypothesis is true. At this stage we are comparing sample statistics, real and expected, not a population parameter.