Question
A researcher wishes to estimate, with 95% confidence, the population proportion of adults who think Congress...
A researcher wishes to estimate, with 95% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 3% 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 36% of the respondents said they think Congress is doing a good or excellent job.
(c) Compare the results from parts (a) and (b).
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