Question: Thequality-control manager at a compact fluorescent light bulb(CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to

Thequality-control manager at a compact fluorescent light bulb(CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7500 hours. The population standard deviation is 945hours. A random sample of 81 light bulbs indicates a sample mean life of 7,259 hours.

a. At the 0.05 level ofsignificance, is there evidence that the mean life is different from 7500hours?

b. Compute thep-value and interpret its meaning.

c. Construct a 95% confidence interval estimate of the population mean life of the light bulbs.

d. Compare the results of(a) and(c). What conclusions do youreach?

e. Compare the results of parts(a) through(d) to those when the standard deviation is 1,350 hours.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Mathematics Questions!

Thequality-control manager at a compact fluorescent light bulb(CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,501 hours. The population standard...

The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,473 hours. The population standard...

If you use a 0.01 level of significance in a two-tail hypothesis test, state your DECISION RULE for rejecting Ho: = 12.5 if you use a Z test? Note: Decision rule is different from decision. Question...

I need help with the following questions. Done in excel and please show work!! Thank you 9.49 You are the manager of a restaurant that delivers pizza to college dormitory rooms. You have just changed...

1.If you use a 0.05 level of significance in a twotail hypothesis test, what decision will you make if ZSTAT= 1.68? Determine the decision rule. Select the correct choice below and fill in the answer...

The TTC has set a bus mechanical reliability goal of 3,800 bus miles. Bus mechanical reliability is measured specifically as the number of bus miles between mechanical road calls. Suppose a sample of...

If, in a (two-tail) hypothesis test, the p-value is 0.1116, what is your statistical decision if you test the null hypothesis at the 0.06 level of signicance? E> Choose the correct answer below? 0 A....

Instructions for Students: Answer ONLY part a in Question 4. Questions carry equal marks. You have to show the work to earn marks. Answers must be uploaded on Moodle under Assignment II. Unless...

If, in a (two-tail) hypothesis test, the p-value is 0.1116, what is your statistical decision if you test the null hypothesis at the 0.06 level of significance? . . . Choose the correct answer below?...

On March 1 of the current year, Mathew acquired a one percent interest in a partnership that carries on a nursing home business in several provinces in Canada. Mathew paid $10,000 for the partnership...

Your mother has recently inherited some money and wishes to invest it wisely. She has been on the web site and looked at some Annual accounts and has a number of questions which she wishes you to...

Question 2 9 2 pts The law requires employers to withhold specified amounts from employees' pay and to keep records of and send these sums to the proper income tax center. Which of the following is...

Exercise 15-15 Grouper Corporations charter authorized 1 million shares of $12 par value common shares, and 200,000 shares of 5% cumulative and non-participating preferred shares, with a par value of...