Question

A survey of 570 working adults in the United States asked each participant how many hours they worked last week. The survey showed an average of 41.525 hours worked per week, with a standard deviation of 14.828 hours. (Note that this is the average for people that work in the United States, including part-time employees. Among full time employees, the average work week is closer to 47 hours. Link if you're interested: http://www.gallup.com/poll/175286/hour-workweek-actually-longer-seven-hours.aspx) Is there enough evidence to show that Americans work more than 40 hours per week on average at the 0.01 significance level? What is the population under study? Select one: a. All working adults in the U.S. that work more than 40 hours per week b. The 570 working adults in the survey c. All working adults in the U.S. d. The 570 working adults in the survey that work over 40 hours per week.

Answer 1

a or t test Should We perform 2- test A 2- test because We standard deviation. and why? the population know a Does this sample setisfy the requirements to perform hypothesis test for a mean? S6 Yes Yes the number of hours worked last week normalt distributed. mul 6 and alternative. Hoi al = 40 HI: .ولد