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Question 11
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A professional employee in a large corporation receives an average of / = 41.1 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 45 employees showed that they were
receiving an average of x = 32.9 e-mails per day. The computer server through which the e-mails are routed showed
that = 18.8. 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. Find (or estimate) the P-value. Round your answer to three
decimal places.
Select one:
O a. 0.997
O b. 0.999
O C. 0.998
o d. 0.003
O e. 0.001

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z-test for mean_080319.png

Hypothesis Test: Mean vs. Hypothesized Value
41.100 hypothesized value
32.900 mean # E-mails
18.800 std. dev.
2.803 std. error
45 n
-2.93 Z
p-value (two-tailed)

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