Chi-Square and Analysis of Variance

An insurance company is interested in the length of hospital-stays for various illnesses. The company has randomly selected 20 patients from hospital A and 25 from hospital B who were treated for the same ailment. The amount of time spent in hospital A had an average of 2.4 days with a standard deviation of 0.6 day. The treatment time in hospital B averaged 2.3 days with a standard deviation of 0.9 day. Do patients at hospital A have signifi cantly less variability in their recovery time? Test at a 0.01 signifi cance level.

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Problems: Chi-Square and Analysis of Variance

Problem-01: Chi-Square and Analysis of Variance

A brand manager is concerned that her brand’s share may be unevenly distributed through-out the coun...

Problem-02: Chi-Square and Analysis of Variance

A brand manager is concerned that her brand’s share may be unevenly distributed through-out the coun...

Problem-03: Chi-Square and Analysis of Variance

An advertising firm is trying to determine the demographics for a new product. They have randomly se...

Problem-04: Chi-Square and Analysis of Variance

Develop a table of observed and expected frequencies for this problem.

Problem-05: Chi-Square and Analysis of Variance

An advertising firm is trying to determine the demographics for a new product. They have randomly se...

Problem-06: Chi-Square and Analysis of Variance

An advertising firm is trying to determine the demographics for a new product. They have randomly se...

Problem-07: Chi-Square and Analysis of Variance

To see whether silicon chip sales are independent of where the U.S. economy is in the business cycle...

Problem-08: Chi-Square and Analysis of Variance

To see whether silicon chip sales are independent of where the U.S. economy is in the business cycle...

Problem-09: Chi-Square and Analysis of Variance

A financial consultant is interested in the differences in capital structure within different firm s...

Problem-10: Chi-Square and Analysis of Variance

A newspaper publisher, trying to pinpoint his market’s characteristics, wondered whether newspaper r...

Problem-11: Chi-Square and Analysis of Variance

An educator has the opinion that the grades high school students make depend on the amount of time t...

Problem-12: Chi-Square and Analysis of Variance

At the 0.10 level of signifi cance, can we conclude that the following 400 observations follow a Po...

Problem-13: Chi-Square and Analysis of Variance

After years of working at a weighing station for trucks, Jeff Simpson feels that the weight per truc...

Problem-14: Chi-Square and Analysis of Variance

Below is an observed frequency distribution. Using a normal distribution with μ = 5 and σ = 1.5, Fi...

Problem-15: Chi-Square and Analysis of Variance

At the 0.05 level of signifi cance, can we conclude the following data follow a Poisson distribution...

Problem-16: Chi-Square and Analysis of Variance

Louis Armstrong, salesman for the Dillard Paper Company, has five accounts to visit per day. It is s...

Problem-17: Chi-Square and Analysis of Variance

The computer coordinator for the business school believes the amount of time a graduate student spen...

Problem-18: Chi-Square and Analysis of Variance

In order to plan how much cash to keep on hand in the vault, a bank is interested in seeing whether ...

Problem-19: Chi-Square and Analysis of Variance

The post offi ce is interested in modeling the mangled-letter problem. It has been suggested that an...

Problem-20: Chi-Square and Analysis of Variance

A state lottery commission claims that for a new lottery game, there is a 10 percent chance of getti...

Problem-21: Chi-Square and Analysis of Variance

Dennis Barry, a hospital administrator, has examined past records from 210 randomly selected 8-hour ...

Problem-22: Chi-Square and Analysis of Variance

A large city fire department calculates that for any given precinct, during any given 8-hour shift, ...

Problem-23: Chi-Square and Analysis of Variance

A diligent statistics student wants to see whether it is reasonable to assume that some sales data h...

Problem-24: Chi-Square and Analysis of Variance

A supermarket manager is keeping track of the arrival of customers at checkout counters to see how m...

Problem-25: Chi-Square and Analysis of Variance

A professional baseball player, Lon Dakestraw, was at bat fi ve times in each of 100 games. Lon clai...

Problem-26: Chi-Square and Analysis of Variance

A study compared the number of hours of relief provided by five different brands of antacid administ...

Problem-27: Chi-Square and Analysis of Variance

Three training methods were compared to see whether they led to greater productivity after training....

Problem-28: Chi-Square and Analysis of Variance

The following data show the number of claims processed per day for a group of four insurance company...

Problem-29: Chi-Square and Analysis of Variance

Given the measurements in the four samples that follow, can we conclude that they come from populati...

Problem-30: Chi-Square and Analysis of Variance

The manager of an assembly line in a clock manufacturing plant decided to study how different speeds...

Problem-31: Chi-Square and Analysis of Variance

We are interested in testing for differences in the palatability of three spicy salsas: A, B, and C....

Problem-32: Chi-Square and Analysis of Variance

The supervisor of security at a large department store would like to know whether the store apprehen...

Problem-33: Chi-Square and Analysis of Variance

An Introduction to Economics course is offered in 3 sections, each with a different instructor. The ...

Problem-34: Chi-Square and Analysis of Variance

The manufacturer of silicon chips requires so-called clean rooms, where the air is specially filtere...

Problem-35: Chi-Square and Analysis of Variance

A lumber company is concerned about how rising interest rates are affecting the new housing starts i...

Problem-36: Chi-Square and Analysis of Variance

Genes-and-Jeans, Inc., offers clones of such popular jeans as Generic, DNA, RNA, and Oops. The store...

Problem-37: Chi-Square and Analysis of Variance

The Government Accounting Office (GAO) is interested in seeing whether similar-sized offices spend ...

Problem-38: Chi-Square and Analysis of Variance

In Bigville, a fast-food chain feels it is gaining a bad reputation because it takes too long to ser...

Problem-39: Chi-Square and Analysis of Variance

LWP is a large multinational company, having more than 2000 employees under its payroll. The managem...

Problem-40: Chi-Square and Analysis of Variance

The standard deviation of a distribution is hypothesized to be 50. If an observed sample of 30 yield...

Problem-41: Chi-Square and Analysis of Variance

Given a sample standard deviation of 6.4 from a sample of 15 observations, construct a 90 percent co...

Problem-42: Chi-Square and Analysis of Variance

MacroSwift has designed a new operating system that will revolutionize the computing industry. The o...

Problem-43: Chi-Square and Analysis of Variance

MacroSwift has designed a new operating system that will revolutionize the computing industry. The o...

Problem-44: Chi-Square and Analysis of Variance

A psychologist is aware of studies showing that the variability of attention spans of 5-year olds ca...

Problem-45: Chi-Square and Analysis of Variance

In checking its cars for adherence to emissions standards set by the government, an automaker measu...

Problem-46: Chi-Square and Analysis of Variance

A bank is considering ways to reduce the costs associated with passbook savings accounts. The bank h...

Problem-47: Chi-Square and Analysis of Variance

Sam Bogart, the owner of the Play-It-Again Stereo Company, offers 1-year warranties on all the ster...

Problem-48: Chi-Square and Analysis of Variance

For two populations thought to have the same variance, the following information was found. A sampl...

Problem-49: Chi-Square and Analysis of Variance

In our study of comparisons between the means of two groups, it was noted that the most common form...

Problem-50: Chi-Square and Analysis of Variance

From a sample of 25 observations, the estimate of the standard deviation of the population was foun...

Problem-51: Chi-Square and Analysis of Variance

Mr. Raj, an investor, has narrowed his search for a mutual fund down to the Oppy fund or the MLPFS ...

Problem-52: Chi-Square and Analysis of Variance

An insurance company is interested in the length of hospital-stays for various illnesses. The compa...

Problem-53: Chi-Square and Analysis of Variance

Nation’s Broadcasting Company is interested in the number of people who tune in to their hit shows ...

Problem-54: Chi-Square and Analysis of Variance

The HAL Corporation is about to unveil a new, faster personal computer, PAL, to replace its old mod...

Problem-55: Chi-Square and Analysis of Variance

Two brand managers were in disagreement over the issue of whether urban homemakers had greater vari...

Problem-56: Chi-Square and Analysis of Variance

Two competing ice cream stores, Yum-Yum and Goody, both advertise quarter-pound scoops of ice cream...

Problem-57: Chi-Square and Analysis of Variance

The post office is concerned about the variability in the number of days it takes a letter to go fr...

Problem-58: Chi-Square and Analysis of Variance

For the following contingency table, calculate the observed and expected frequencies and the chi-sq...

Problem-59: Chi-Square and Analysis of Variance

Marketers know that tastes differ in various regions of the country. In the rental car business, an...

Problem-60: Chi-Square and Analysis of Variance

What probability distribution is used in each of these types of statistical tests? (a) Comparing tw...

Problem-61: Chi-Square and Analysis of Variance

What probability distribution is used in each of these types of statistical tests? (a) Comparing th...

Problem-62: Chi-Square and Analysis of Variance

Retail stores set prices, but manufacturers have an interest in fi nal retail price as this is part ...

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