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 1 % 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 44 % 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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