Suppose the historical average work week was 39.2 hours and SD was 4.8 hours as reported by the Department of Labor. This year a study of 112 workers showed a mean of 38.5 hours. Test whether the workweek is the same or significantly shorter due to the recession. (Left tail. Ho: M=> 39.2). Use a .02 significance level.
a. Critical Value:
b. What is the appropriate calculated T or Z:
c. Statistical conclusion:
d. Practical conclusion: