SOLUTION: James Desreumaux, VP of Human Resources of American First Banks(AFB), is reviewing the employee training programs of AFB banks. His staff randomly selected personnel files for 100
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Question 1149099: James Desreumaux, VP of Human Resources of American First Banks(AFB), is reviewing the employee training programs of AFB banks. His staff randomly selected personnel files for 100 tellers in the Southeast Region and determined that their mean training time was 25 hours. Assume that the population standard deviation is 5 hours. The 88% confidence interval for the population mean of training times is
A) 17.25 to 32.75
B) 24.23 to 25.78
C) 19.15 to 30.85
D) 24.42 to 25.59
E) 21.00 to 32.00 Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! half-interval is z*sigma/sqrt(n); z(0.94)=1.55
half-interval is 1.55*5/sqrt(100)=0.775
interval is 25+/- 0.775 or (24.225, 25.775)
B
