A researcher wishes to estimate, with 95% con dence the popula on proportion of

Question

A researcher wishes to estimate, with 95% con dence the popula on proportion of adults who think the president o ther country can control the price of gasoline. Her est a) No b) Find the c) Compare the results from parts (a) and (b). sample size needed, using a prior study that found that 38% of the respondents said they think their president can control the price of gasoline. (a) What is the n- 9051 (Round up to the nearest whole number as needed) y at s te m um sample size needed using a p or study that ord that 38% of the respondents said they think their president can control the price of gasoline? n=[9604](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 B, Having an estimate of tre population proportion reduces the minimum sample size needed O C. Having an estimate of the population proportion has no effect on the minimum sample size needed

Explanation / Answer

your answer for a should be in b and b's in a.

a)

b)

c)

option B is correct

here margin of error E = 0.01 for95% CI crtiical Z          = 1.9600 estimated proportion=p= 0.5000 required sample size n =         p*(1-p)*(/E)2= 9604.00

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