James Desreumaux, VP of Human Resources of Maritime Boat Manufacturing

Multiple Choice

James Desreumaux, VP of Human Resources of Maritime Boat Manufacturing (MBM) , is reviewing the employee training programs of MBM factories.His staff randomly selected personnel files for 10 workers in Nova Scotia, and determined that their mean training time was 25 hours and that the standard deviation was 5 hours.Assume that training times are normally distributed.The 90% confidence interval for the population variance of training times is ___.

A) 11.83 to 83.33
B) 2.37 to 16.67
C) 2.66 to 13.51
D) 13.30 to 67.67
E) 15.00 to 68.00