A researcher wishes to estimate, with 90% confidence, the population proportion

Question

A researcher wishes to estimate, with 90% confidence, the population proportion of adults who think the president of their country can control the price of gasoline. 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 40% of the respondents said they think their president can control the price of gasoline c) Compare the results from parts (a) and (b) (a) What is the minimum sample size needed assuming that no prior information is available? n = (Round up to the nearest whole number as needed.) L.3

Explanation / Answer

Minimum sample size for a population of 100 is 81

Minimum sample size for a population of 1000 is 297

Minimum sample size for a population of 1000 is 404

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