Introduction to Confidence Intervals Answers

A city library selects a random sample of 1,250 of its patrons and finds that the 90% confidence interval for the proportion of those who have read an e-book in the previous 12 months is (0.71, 0.75).

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A nationwide poll asked a random sample of US adults the question, “Are you in favor of making Election Day a federal holiday?” Based on the results of this poll, the 95% confidence interval for the population proportion who favor making Election Day a federal holiday is (0.64, 0.70). Calculate the point estimate and margin of error for the given confidence interval. Enter both values to 2 decimal places. The point estimate = The margin of error =

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The chamber of commerce for a beach town asked a random sample of city dwellers, “Would you like to live at the beach?” Based on this survey, the 95% confidence interval for the population proportion of city dwellers who would like to live at the beach is (0.56, 0.62). Calculate the point estimate and margin of error for the given confidence interval. Enter both values to 2 decimal places. The point estimate = The margin of error =

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