This Question: 8 pts 24 of 31 A researcher wishes to estimate, with 95% confiden

Question

This Question: 8 pts 24 of 31 A researcher wishes to estimate, with 95% confidence, the population proportion of adults who say chocolate is their favorite ice cream navor Her estimate must b (a) No preliminary estimate is available. Find the minimum sample size (b) Find the minimum sample size needed, using a prior study that found that 26% of the respondents said their favorite flavor of ice cream is chocolate (c) Compare the results from parts (a) and (b) (a) What is the minimum sample size needed assuming that no prior information is available? n Round up to the nearest whole number as needed) (b) What is the minimum sample size needed using a prior study that found that 2e% of the respondents said their favorite ice cream flavor is c n- (Round up to the nearest whole number as needed) (c) How do the results from (a) and (b) compare? o A. Having an estimate of the population proportion raises the minimum sample size needed O B. Having an estimate of the population proportion has no effect on the minimum sample size needed O c. Having an estimate of the population proportion reduces the minimum sample size needed

Explanation / Answer

here for 95% Ci, z=1.96

margin of error E=0.03

a) hence with no prior information we estimate p=0.5

hence sample size=(p(1-p)(Z/E)2 ~1068

b) with p=0.26

sample size n=822

c) option A is correct

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