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 4%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 40%of the respondents said their favorite flavor of ice cream is chocolate.

(c) Compare the results from parts(a) and(b).

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