Question

In preparation for upcoming wage negotiations with the union, the managers for the Bevel Hardware Company want to establish the time required to assemble a kitchen cabinet. A first line supervisor believes that the job should take 40 minutes on average to complete. A random sample of 120 cabinets has an average assembly time of 42 minutes with a standard deviation of 8 minutes. Is there overwhelming evidence to contradict the first line supervisor’s belief at a 0.2 significance level? Step 1 of 3 : Find the value of the test statistic. Round your answer to three decimal places, if necessary.

Answer 1

Test statistic = t

= ( - ) / s / n

= (42 - 40) / 8 / 120

= 2.739

Test statistic =  2.739