Question

A professional employee in a large corporation receives an
average of µ = 41.7 e-mails per day. An anti-spam protection
program was installed in the company's server and one month later a
random sample of 45 employees showed that they were receiving an
average of ?̅= 36.2 e-mails per day. Assume that ơ = 18.45. Use a
5% level of significance to test whether there has been a change
(either way) in the average number of emails received per day per
employee.

**a.)** What is α? State the null and alternate
hypotheses. Will you use a left-tailed, right-tailed, or two-tailed
test?

αα =

H0H0: μμ =

H1H1: μμ Select an answer < not = >

The test is a Select an answer two-tailed right-tailed
left-tailed test

**b.)** Identify the Sampling Distribution you will
use. What is the value of the test statistic?

The best sampling distribution to use is the Select an answer
Normal Student's t distribution.

The test statistic (z or t value) is =

**c.)** Find or estimate the P-value for the
test.

The p-value is =

**d.)** Conclude the test.

Based on this we will Select an answer Reject Fail to
reject the null hypothesis.

Answer #1

A professional employee in a large corporation receives an
average of µ = 41.7 e-mails per day. An anti-spam protection
program was installed in the company's server and one month later a
random sample of 45 employees showed that they were receiving an
average of ?̅= 36.2 e-mails per day. Assume that ơ = 18.45. Use a
5% level of significance to test whether there has been a change
(either way) in the average number of emails received per day...

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Recently the national average yield on municipal bonds has been
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