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Ten years ago, only 20% of the u.s. population consisted of people more than 65 years old. a researcher plans to use a sample of n = 200 people to determine whether the population distribution has changed during the past ten years. if a chi-square test is used to evaluate the data, what is the expected frequency for the older-than-65 category?

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MakaylaIsAwesome44
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The expected frequency is the sample size n multiplied by the population proportion p obtained from the null hypothesis.:
[tex]n\times p=200\times0.2=40 [/tex]
The answer is: the expected frequency is 40.

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