A researcher wishes to estimate, with 90% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 4% of the true...

A researcher wishes to estimate, with

90%

confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within

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

34%

of the respondents said they think Congress is doing a good or excellent job.

Jun 08, 2022

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