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Mathematics, 03.12.2019 05:31 rouchedavisin4

Aresearcher wishes to estimate, with 95% confidence, the population proportion of adults who think the president of their country can control the price of gasoline. her estimate must be accurate within 5% of the true 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 they think their president can control the price of gasoline.
(c) compare the results from parts (a) and (b).

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