# 1. In Exercises 25-28, use the confidence interval to find the margin of error and the samp 1 answer below »

1. In Exercises 25–28, use the confidence interval to find the margin of error and the sample mean.

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25. (12.0, 14.8)   26. (21.61, 30.15)

27. (1.71, 2.05)   28. (3.144, 3.176)

2. In Exercises 29–32, determine the minimum sample size n needed to estimate m for the values of c, s, and E.

29. c = 0.90, s = 6.8, E = 1      30. c = 0.95, s = 2.5, E = 1

31. c = 0.80, s = 4.1, E = 2      32. c = 0.98, s = 10.1, E = 2

3. Finding the Margin of Error In Exercises 33 and 34, use the confidence interval to find the estimated margin of error. Then find the sample mean.

33. Commute Times A government agency reports a confidence interval of (26.2, 30.1) when estimating the mean commute time (in minutes) for the population of workers in a city.

34. Book Prices A store manager reports a confidence interval of (44.07, 80.97) when estimating the mean price (in dollars) for the population of textbooks.