October 29, 2023 at 9:10 PM 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 1% 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 32 32% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b). 1

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