A Mail-Order Business Prides Itself in Its Ability to Fill

Multiple Choice

A mail-order business prides itself in its ability to fill customers' orders in less than six calendar days,on average.Periodically,the operations manager selects a random sample of customer orders and determines the number of days required to fill the orders.On one occasion when a sample of 39 orders was selected,the average number of days was 6.65 with a sample standard deviation of 1.5 days.Calculate the appropriate test statistic to test the hypotheses.

A) 2.71
B) 16.90
C) 0.65
D) -2.71
E) 3.31