In a random sample of 21 people, the mean commute time to work was 33.1...
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In a random sample of 21 people, the mean commute time to work was 33.1 minutes and the standard deviation was 7.2 minutes. Assume the population is normally distributed and use a t-distribution to construct a 80% confidence interval for the population mean ?. What is the margin of error of u? Interpret the results.The confidence interval for the population mean ? is (-(Round to one decimal place as needed.)The margin of error of ? is.(Round to one decimal place as needed.)Interpret the results.A. It can be said that 80% of people have a commute time between the bounds of the confidence interval.B. With 80% confidence, it can be said that the commute time is between the bounds of the confidence interval.C. If a large sample of people are taken approximately 80% of them will have commute times between the bounds of the confidence interval.D. With 80% confidence, it can be said that the population mean commute time is between the bounds of the confidence interval.
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