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

Question

2 years ago

14

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?

Mathematics

2 answers:

Strike441 [17] · Answer 1 · 2022-07-04T04:47:16+03:00

Strike441 [17]2 years ago

5 0

Hello person i don't know

UkoKoshka [18] · Answer 2 · 2022-07-04T05:51:54+03:00

UkoKoshka [18]2 years ago

5 0

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