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

4 %

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 46 %
of the respondents said they think Congress is doing a good or excellent job.

(a) What is the minimum sample size needed assuming tha

Jun 01, 2022

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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...

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