A professional employee in the large corporation receives average of = 40.2 e-mails for each 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 34 employees showed that they were receiving an average of = 34.8 e-mails per day. The computer server through which the e-mails are routed showed that = 18.2. Has the new policy had any effect? Use a 5% 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. If the test statistic z = -1.73, find (or estimate) the P-value.
Answer
a. 0.021
b. 0.084
c. 0.979
d. 0.958
e. 0.916