A Professional Employee in a Large Corporation Receives an Average $\mu$

Multiple Choice

A professional employee in a large corporation receives an average of $\mu$ = 41.5 e-mails per day. Most of these e-mails are from other employees in the company. Because of the large number of e-mails, employees find themselves distracted and are unable to concentrate when they return to their tasks. In an effort to reduce distraction caused by such interruptions, one company established a priority list that all employees were to use before sending an e-mail. One month after the new priority list was put into place, a random sample of 37 employees showed that they were receiving an average of x = 33.8 e-mails per day. The computer server through which the e-mails are routed showed that $\sigma$ = 19.5 Has the new policy had any effect? Use a 10% level of significance to test the claim that there has been a change (either way) in the average number of e-mails received per day per employee. What is the level of significance?

A) $\alpha$ = 0.95
B) $\alpha$ = 0.90
C) $\alpha$ = 0.80
D) $\alpha$ = 0.20
E) $\alpha$ = 0.10