A researcher wishes to estimate, with 95% confidence, the population proportion

Question

A researcher wishes to estimate, with 95% confidence, the population proportion of adults who say chocolate is their favorite ice cream flavor. Her estimate must be accurate within 3% of the population proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 18% 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? nequals nothing (Round up to the nearest whole number as needed.) (b) What is the minimum sample size needed using a prior study that found that 18% of the respondents said their favorite ice cream flavor is chocolate? nequals nothing (Round up to the nearest whole number as needed.) (c) How do the results from (a) and (b) compare?

Explanation / Answer

a)

b)

c)

having prior estimate reduce sample size requirement.

here margin of error E = 0.03 for95% CI crtiical Z          = 1.9600 estimated proportion=p= 0.5000 required sample size n =         p*(1-p)*(/E)2= 1068.00

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