Two processes for manufacturing 60 watt light bulbs are under study In both cases, the life (in hours) of the bulb before it burns out is being examined A random sample of 18 light bulbs manufactured using the old process showed the sample variance of lifetimes to be s 2 51 87 Another random sample of 16 light bulbs manufactured using the new process showed the sample variance of the lifetimes to be s 2 135 24 Use a 5 level of significance to test the claim that the population variance of lifetimes for the new manufacturing process is larger than that of the old process

Question: Two processes for manufacturing 60-watt light bulbs are under study. In both cases, the life (in hours) of the bulb before it burns out is

Two processes for manufacturing 60-watt light bulbs are under study. In both cases, the life (in hours) of the bulb before it burns out is being examined. A random sample of 18 light bulbs manufactured using the old process showed the sample variance of lifetimes to be s² = 51.87. Another random sample of 16 light bulbs manufactured using the new process showed the sample variance of the lifetimes to be s² = 135.24. Use a 5% level of significance to test the claim that the population variance of lifetimes for the new manufacturing process is larger than that of the old process.

Step by Step Solution

★★★★★

3.25 Rating (160 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

F test for the equality of two variances i a 005 ii Since s 2 13... View full answer

Question Has Been Solved by an Expert!

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

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

1275-M-S-P-E(1460).docx

120 KBs Word File

Students Have Also Explored These Related Statistics Questions!

Two processes for manufacturing large roller bearings are under study. In both cases, the diameters (in centimeters) are being examined. A random sample of 21 roller bearings from the old...

A box containing twelve 40-watt light bulbs and eighteen 60-watt light bulbs is stored in your basement. Unfortunately, the box is stored in the dark and you need two 60-watt bulbs. What is the...

Electric manufactures a decorative Crystal Clear 60-watt light bulb that it advertises will last 1500 hours. Suppose that the lifetimes of the light bulbs are approximately normally distributed, with...

13. Engineering: Light Bulbs Two processes for manufacturing 60-watt light bulbs are under study. In both cases, the life (in hours) of the bulb before it burns out is being examined. A random sample...

Engineering: Light Bulbs Two processes for manufacturing 60-watt light bulbs are under study. In both cases, the life (in hours) of the bulb before it burns out is being examined. A random sample of...

The St. Lucie County Economic Development Board needs to estimate the proportion of all county residents who have earned at least a bachelor's degree. A random sample conducted by the St. Lucie...

Answer the following questions. 1 In a primary school, there are two standard classes with 35 and 40 students. respectively. Within the first class. 18 students are female, whereas within the second...

1. A player throws a fair die and simultaneously flips a fair coin. If the coin lands heads, then she wins twice, and if tails, then one-half of the value that appears on the die. Determine her...

1.Improvements in operations are achieved by reducing the causes and impacts of variation. True or False 2.Setting targets for each performance provides the basis for strategy deployment. True or...

A noted psychic was tested for ESP. The psychic was presented with 260 cards face down and was asked to determine if the card was one of 5 symbols: a star, cross, circle, square, or three wavy lines....

A cylindrical superconductor of radius 200 cm with an axial hole in the center of radius 100 cm is located in a parallel magnetic field of 2T at 300 K. It has a penetration depth of 2000 A. What...

The ultimate aim of accounting standards is to encourage widespread use of particular standards in financial reporting and to eliminate undesirable alternatives. Select one: O True False

7. Discuss the reasons for e-commerce failures.

Charlotte is doing a study on fraud and identity theft based both on source (checks, credit cards, debit cards, online banking/finance sites, other) and on gender of the victim. Describe the sampling...

Consider Zanes study regarding products recycled and age group. Suppose he found a sample x2 = 16.83. (a) How many degrees of freedom are used? Recall that there were 4 age groups and 3 products...

Consider Charlottes study of source of fraud/identity theft and gender. She computed sample x2 = 10.2. (a) How many degrees of freedom are used? Recall that there were 5 sources of fraud/identity...

The average cost of electricity used for an 18 cubic ft refrigerator that is 10 years old is 128$ per year a new refrigerator the same size costs about 81$ per year for electricity

Desai Industries is analyzing an average-risk project, and the following data have been developed. Unit sales will be constant, but the sales price should increase with inflation. Fixed costs will...

Troy Engines, Ltd., manufactures a variety of engines for use in heavy equipment. The company has always produced all of the necessary parts for its engines, including all of the carburetors. An...