Question: Construct a 90% confidence interval for the population mean in Exercise 1. Interpret the results. Exercise 1 The waking times (in minutes past 5:00 a.m.)

Construct a 90% confidence interval for the population mean in Exercise 1. Interpret the results.

Exercise 1

The waking times (in minutes past 5:00 a.m.) of 40 people who start work at 8:00 a.m. are shown in the table. Assume the population standard deviation is 45 minutes. Find

(a) The point estimate of the population mean μ and

(b) The margin of error for a 90% confidence interval.

Waking times (in minutes past 5:00 A.M.) 135 145 95 140 135 95 110 50 90 165 110 125 80 125 130 110 25 75 65 100 60 125 115 135 95 90 140 40 75 50 130 85 100 160 135 9 45 135 115 75 130

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