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. |
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