Question

A professional employee in a large corporation receives an average of µ = 41.7 e-mails per...

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.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A professional employee in a large corporation receives an average of µ = 41.7 e-mails per...
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...
A professional employee in a large corporation receives an average of μ = 42.7 e-mails per...
A professional employee in a large corporation receives an average of μ = 42.7 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...
A professional employee in a large corporation receives an average of u=40 e-mails per day. Most...
A professional employee in a large corporation receives an average of u=40 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...
A professional employee in a large corporation receives an average of  e-mails per day. Most of these...
A professional employee in a large corporation receives an average of  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...
A professional employee in a large corporation receives an average of μ = 44.1 e-mails per...
A professional employee in a large corporation receives an average of μ = 44.1 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...
USA Today reported that the population mean life span of people who live in Hawaii is...
USA Today reported that the population mean life span of people who live in Hawaii is 77 years. A random sample of 20 obituary notices gave a sample mean life span of ?̅= 71.4 years and a sample standard deviation s = 20.65 years. Assuming that the life span of people in Hawaii is normally distributed, does this indicate that the population mean life span is less than 77 years? Use a 5% level of significance. a.) What is α?...
Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of...
Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of the blood). For healthy adults, the mean of the x distribution is μ = 7.4. A new drug for arthritis has been developed. However, it is thought that this drug may change blood pH. A random sample of 41 patients with arthritis took the drug for 3 months. Blood tests showed that x-bar = 8.5 with sample standard deviation s = 2.9. Use a...
Recently the national average yield on municipal bonds has been µ = 4.19%. A random sample...
Recently the national average yield on municipal bonds has been µ = 4.19%. A random sample of 16 Arizona municipal bonds had an average yield of 5.11% with a sample standard deviation of s = 1.15%. Does this indicate that the population mean yield for all Arizona municipal bonds is greater than the national average? Use a 5% level of significance. Assume x is normally distributed. (A) State the null and alternate hypotheses and the level of significance. Is the...
The average annual salary of employees at Wintertime Sports was $28,750 last year. This year the...
The average annual salary of employees at Wintertime Sports was $28,750 last year. This year the company opened another store. Suppose a random sample of 18 employees had an average annual salary of x = $25,810 with sample standard deviation of s = $4,230. Use a 1% level of significance to test the claim that the average annual salary for all employees is different from last year’s average salary. State the null and alternate hypotheses. Is the test left-tailed, right-tailed,...
Recently the national average yield on municipal bonds has been ? = 4.19%. A random sample...
Recently the national average yield on municipal bonds has been ? = 4.19%. A random sample of 16 Arizona municipal bonds had an average yield of 5.11% with a sample standard deviation of s = 1.15%. Does this indicate that the population mean yield for all Arizona municipal bonds is greater than the national average? Use a 5% level of significance. Assume x is normally distributed. a. State the null and alternate hypotheses and the level of significance. Is the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT