Question Help | A researcher studying public opinion of proposed Social Security

Question

Question Help | A researcher studying public opinion of proposed Social Security changes obtains a simple random sample of 50 adult Americans and asks them whether or not they Americans does the researcher need to sample in the following cases? (a) 20% of all adult Americans support the changes changes. To say that the distribution of the who respond yes, is approximately normal, how many more adult (b) 25% of all adult Americans support the changes a) The researcher must ankmore American adults.(Round up to the nearest integar) (b) The researcher must ask more American adults. (Round up to the nearest integer )

Explanation / Answer

Sample size = n = 50

a) p = 0.20

Number of adult = n*p

0.20*50 = 10

b) p = 0.25

Number of adults = n*p

0.25*50 = 12.5 == 13

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