Question

6.3.17 A researcher wishes to​ estimate, with 9090​% ​confidence, the population proportion of adults who think...

6.3.17

A researcher wishes to​ estimate, with

9090​%

​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

55​%

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

4646​%

of the respondents said they think their president can control the price of gasoline.

​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.)

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