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A researcher wishes to estimate, with 95% confidence, the population of adults who think Congress is...

A researcher wishes to estimate, with 95% confidence, the population 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 44% of the respondents said they think Congress is doing a good or excellent job.

(c) Compare the results from parts (a) and (b).

Math   Statistics-And-Probability   
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Answer #1

(a)

(b)

(c) Part (b) sample size is smaller.

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