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 30 orders was selected, the average number of days was 6.65 with a sample standard deviation of 1.5 days. Assume the time in which an order is filled is normally distributed.

-Calculate the appropriate test statistic to test the hypotheses.
A)2.37
B)16.90
C)0.65
D)-2.37
E)3.31

Question

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 30 orders was selected, the average number of days was 6.65 with a sample standard deviation of 1.5 days. Assume the time in which an order is filled is normally distributed.

-Calculate the appropriate test statistic to test the hypotheses.

-Calculate the appropriate test statistic to test the hypotheses.
A)2.37
B)16.90
C)0.65
D)-2.37
E)3.31

Quizplus · Accepted Answer

The test statistic is calculated as (6.65 - 6) / (1.5 / sqrt(30)) = 2.37.

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