Question

A researcher wishes to​ estimate, with 9595​% ​confidence, the population proportion of adults who think Congress...

A researcher wishes to estimate, with
9595%
confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within
33%
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
4040%
of the respondents said they think Congress is doing a good or excellent job.
(c) Compare the results from parts (a) and (b).

Homework Answers

Answer #1

(a)

(b)

(c) sample size is smaller for part(b)

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