Question: A random sample of size 20 is drawn from a population having a normal distribution. The sample mean and the sample standard deviation from the

A random sample of size 20 is drawn from a population having a normal distribution. The sample mean and the sample standard deviation from the data are given, respectively, as = –2:2 and σ = 1.42. Construct a 90% confidence interval for the population variance σ2 and interpret.

Step by Step Solution

★★★★★

3.31 Rating (181 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

n 20 x 22 s 142 C 90 2 From the x table x 19005 3... 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)

610-M-S-O-T-S-E (898).docx

120 KBs Word File

Students Have Also Explored These Related Statistics Questions!

A random sample of size 20 is taken, resulting in a sample mean of 16.45 and a sample standard deviation of 3.59.Assume x is normally distributed and use this information and = .05 to test the...

A random sample of size 20 from a normal distribution with = 4 produced a sample mean of 8. (a) Is the distribution normal? Explain. (b) Compute the sample test statistic z under the null...

A random sample of size 20 from normal population A has a variance of 2000. A second (independent) random sample of size 10 from normal population B has a variance of 2500. Test a null hypothesis...

A random sample of size 26 is drawn from a population having a normal distribution. The sample mean and the sample standard deviation from the data are given, respectively, as = 2:22 and s = 1.67....

Question: An oil company produces oil from two wells. Well 1 can produce up to 150,000 barrels per day, and well 2 can produce up to 200,000 barrels per day. It is possible to ship oil directly from...

Limits theorem A sample of size n is taken from a population with an unknown distribution, with mean // and standard deviation O. Which of the following statements about the sample mean distribution...

A small publishing company decides to use one section of its plant to produce two textbooks called Microeconomics and Macroeconomics. The profit made on each copy is $12 for Microeconomics and $18...

Question: The personnel dept. of a certain industrial firm used 7 subjects in a study to determine the relationship between job performance rating(y) and scores of four tests. The data are as...

Answer the following econmics Markets for Goods end Services Fimys Households G Markets for Factors of D Production Refer to Figure 2-1 Which anow represents the flow of land, labor, and capital? ObD...

The Otto-cycle engine in a Mercedes-Benz SLK230 has a compression ratio of 8.8. (a) What is the ideal efficiency of the engine? Use Y = 1.40. (b) The engine in a Dodge Viper GT2 has a slightly higher...

Consider an individual who consumes quantities x and quantitites y of two goods in each week, and works for hours. These three quantitites (x, y, e) are chosen to maximize the utility function U(x,...

Using the information provided. Determine Windsor Corporation's current cash debt coverage, cash debt coverage, and free cash flow. Net Cash Provided by Operating Activities = $ 1 3 6 8 0 0 Show all...

The breakthrough products for many companies did not emerge from the formal new-product-development process. Instead, they were championed by a few resourceful employees. What steps can organizations...

An article in Fortune (September 21, 1992) claimed that nearly one-half of all engineers continue academic studies beyond the B.S. degree, ultimately receiving either an M.S. or a Ph.D. degree. Data...

A manufacturer of interocular lenses is qualifying a new grinding machine and will qualify the machine if the percentage of polished lenses that contain surface defects does not exceed 2%. A random...

A researcher claims that at least 10% of all football helmets have manufacturing flaws that could potentially cause injury to the wearer. A sample of 200 helmets revealed that 16 helmets contained...

You run a construction firm. You have just won a contract to build a government office complex. Building it will require an investment of $10.2 million today and $5.2 million in one year. The...

Fun Land is considering adding a miniature golf course to its facility. The course would cost $51,000, would be depreciated on a straight line basis over its 4-year life, and would have a zero...

Assume that you have recently purchased 120 shares in an investment company. Upon examining the balance sheet, you note that the firm is reporting $300 million in assets, $90 million in liabilities,...