Testing Hypotheses: One Sample Tests

In 1995, the average 2-week-advance-purchase airfare between Raleigh-Durham, North Carolina, and New York City was $235. The population standard deviation was $68. A1996 survey of 90 randomly chosen travelers between these two cities found that they had paid $218.77, on average, for their tickets. Did the average airfare on this route change significantly between 1995 and 1996? What is the largest α at which you would conclude that the observed average fare is not signifi cantly different from $235?

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Problems: Testing Hypotheses: One Sample Tests

Problem-1: Testing Hypotheses: One Sample Tests

How many standard errors around the hypothesized value should we use to be 99.44 percent certain tha...

Problem-2: Testing Hypotheses: One Sample Tests

An automobile manufacturer claims that a particular model gets 28 miles to the gallon. The Environme...

Problem-3: Testing Hypotheses: One Sample Tests

If we reject a hypothesized value because it differs from a sample statistic by more than 1.75 stand...

Problem-4: Testing Hypotheses: One Sample Tests

How many standard errors around the hypothesized value should we use to be 98 percent certain that w...

Problem-5: Testing Hypotheses: One Sample Tests

Sports and media magnate Ned Sterner is interested in purchasing the Atlanta Stalwarts if he can be ...

Problem-6: Testing Hypotheses: One Sample Tests

Computing World has asserted that the amount of time owners of personal computers spend on their mac...

Problem-7: Testing Hypotheses: One Sample Tests

A grocery store has specially packaged oranges and has claimed a bag of oranges will yield 2.5 quart...

Problem-8: Testing Hypotheses: One Sample Tests

For the following cases, specify which probability distribution to use in a hypothesis test: (a) H ...

Problem-9: Testing Hypotheses: One Sample Tests

Martha Inman, a highway safety engineer, decides to test the load-bearing capacity of a bridge that ...

Problem-10: Testing Hypotheses: One Sample Tests

Formulate null and alternative hypotheses to test whether the mean annual snowfall in Buffalo, New Y...

Problem-11: Testing Hypotheses: One Sample Tests

Describe what the null and alternative hypotheses typically represent in the hypothesis-testing proc...

Problem-12: Testing Hypotheses: One Sample Tests

Defi ne the term signifi cance level.Contact us for the solution

Problem-13: Testing Hypotheses: One Sample Tests

Defi ne Type I and Type II errors.Contact us for the solution

Problem-14: Testing Hypotheses: One Sample Tests

In a trial, the null hypothesis is that an individual is innocent of a certain crime. Would the lega...

Problem-15: Testing Hypotheses: One Sample Tests

What is the relationship between the significance level of a test and Type I error?Contact us for th...

Problem-16: Testing Hypotheses: One Sample Tests

If our goal is to accept a null hypothesis that μ = 36.5 with 96 percent certainty when it’s true, a...

Problem-17: Testing Hypotheses: One Sample Tests

For the following cases, specify which probability distribution, to use in a hypothesis test: (a) H...

Problem-18: Testing Hypotheses: One Sample Tests

Your null hypothesis is that the battery for a heart pacemaker has an average life of 300 days, with...

Problem-19: Testing Hypotheses: One Sample Tests

Under what conditions is it appropriate to use a one-tailed test? A two-tailed test?.Contact us for ...

Problem-20: Testing Hypotheses: One Sample Tests

If you have decided that a one-tailed test is the appropriate test to use, how do you decide whether...

Problem-21: Testing Hypotheses: One Sample Tests

The statistics department installed energy-efficient lights, heaters, and air conditioners last year...

Problem-22: Testing Hypotheses: One Sample Tests

Dr. Ross Darrow believes that nicotine in cigarettes causes cigarette smokers to have higher daytime...

Problem-23: Testing Hypotheses: One Sample Tests

Hinton Press hypothesizes that the average life of its largest web press is 14,500 hours. They know ...

Problem-24: Testing Hypotheses: One Sample Tests

American Theaters knows that a certain hit movie ran an average of 84 days in each city, and the cor...

Problem-25: Testing Hypotheses: One Sample Tests

Atlas Sporting Goods has implemented a special trade promotion for its propane stove and feels that ...

Problem-26: Testing Hypotheses: One Sample Tests

From 1980 until 1985, the mean price/earnings (P/E) ratio of the approximately 1,800 stocks listed o...

Problem-27: Testing Hypotheses: One Sample Tests

Generally Electric has developed a new bulb whose design specifications call for a light out- put of...

Problem-28: Testing Hypotheses: One Sample Tests

Maxwell’s Hot Chocolate is concerned about the effect of the recent year-long coffee adver- tising c...

Problem-29: Testing Hypotheses: One Sample Tests

The average commission charged by full-service brokerage firms on a sale of common stock is $144, an...

Problem-30: Testing Hypotheses: One Sample Tests

Each day, the United States Customs Service has historically intercepted about $28 million in contra...

Problem-31: Testing Hypotheses: One Sample Tests

Before the 1973 oil embargo and subsequent increases in the price of crude oil, gasoline usage in th...

Problem-32: Testing Hypotheses: One Sample Tests

The Bay City Bigleaguers, a semiprofessional baseball team, have the player who led the league in ba...

Problem-33: Testing Hypotheses: One Sample Tests

A ketchup manufacturer is in the process of deciding whether to produce a new extra-spicy brand. The...

Problem-34: Testing Hypotheses: One Sample Tests

Steve Cutter sells Big Blade lawn mowers in his hardware store, and he is interested in comparing th...

Problem-35: Testing Hypotheses: One Sample Tests

Grant, Inc., a manufacturer of women’s dress blouses, knows that its brand is carried in 19 per- cen...

Problem-36: Testing Hypotheses: One Sample Tests

From a total of 10,200 loans made by a state employees’ credit union in the most recent 5-year perio...

Problem-37: Testing Hypotheses: One Sample Tests

Feronetics specializes in the use of gene-splicing techniques to produce new pharmaceutical compound...

Problem-38: Testing Hypotheses: One Sample Tests

Some financial theoreticians believe that the stock market’s daily prices constitute a “random walk ...

Problem-39: Testing Hypotheses: One Sample Tests

MacroSwift estimated last year that 35 percent of potential software buyers were planning to wait to...

Problem-40: Testing Hypotheses: One Sample Tests

Rick Douglas, the new manager of Food Barn, is interested in the percentage of customers who are tot...

Problem-41: Testing Hypotheses: One Sample Tests

Given a sample mean of 83, a sample standard deviation of 12.5, and a samplesize of 22, test the hyp...

Problem-42: Testing Hypotheses: One Sample Tests

Picosoft, Ltd., a supplier of operating system software for personal computers, was planning the ini...

Problem-43: Testing Hypotheses: One Sample Tests

Given a sample mean of 94.3, a sample standard deviation of 8.4, and a sample size of 6, test the hy...

Problem-44: Testing Hypotheses: One Sample Tests

If a sample of 25 observations reveals a sample mean of 52 and a sample variance of 4.2, test the hy...

Problem-45: Testing Hypotheses: One Sample Tests

Realtor Elaine Snyderman took a random sample of 12 homes in a prestigious suburb of Chicago and fou...

Problem-46: Testing Hypotheses: One Sample Tests

For a sample of 60 women taken from a population of over 5,000 enrolled in a weight- reducing progra...

Problem-47: Testing Hypotheses: One Sample Tests

The data-processing department at a large life insurance company has installed new color video displ...

Problem-48: Testing Hypotheses: One Sample Tests

As the bottom fell out of the oil market in early 1986, educators in Texas worried about how the res...

Problem-49: Testing Hypotheses: One Sample Tests

A television documentary on overeating claimed that Americans are about 10 pounds over- weight on av...

Problem-50: Testing Hypotheses: One Sample Tests

XCO, a multinational manufacturer, uses a batch process to produce widgets. Each batch of widgets ta...

Problem-51: Testing Hypotheses: One Sample Tests

For the following situations, state appropriate null and alternative hypotheses. (a) The Census Bu...

Problem-52: Testing Hypotheses: One Sample Tests

Health Electronics, Inc., a manufacturer of pacemaker batteries, specifies that’ the life of each ba...

Problem-53: Testing Hypotheses: One Sample Tests

A manufacturer of petite women’s sportswear has hypothesized that the average weight of the women bu...

Problem-54: Testing Hypotheses: One Sample Tests

Many cities have adopted High Occupancy Vehicle (HOV) lanes to speed commuter traffic to downtown bu...

Problem-55: Testing Hypotheses: One Sample Tests

In Exercise SC 8-5, what would be the power of the test for μ = 14,000,13,500, and 13,000 if the sig...

Problem-56: Testing Hypotheses: One Sample Tests

On an average day, about 5 percent of the stocks on the New York Stock Exchange set a new high for t...

Problem-57: Testing Hypotheses: One Sample Tests

In response to criticism concerning lost mail, the U.S. Postal Service initiated new procedures to a...

Problem-58: Testing Hypotheses: One Sample Tests

What is the probability that we are rejecting a true null hypothesis when we reject the hypoth- esiz...

Problem-59: Testing Hypotheses: One Sample Tests

Do significantly fewer closed end equity funds sell at a discount than at a premium ? Test at @=0.01...

Problem-60: Testing Hypotheses: One Sample Tests

A finace professor developed a theory that predicted that closed end equity funds should sell at a p...

Problem-61: Testing Hypotheses: One Sample Tests

If we wish to accept the null hypothesis 85 percent of the time when it is correct, within how many ...

Problem-62: Testing Hypotheses: One Sample Tests

Federal environmental statutes applying to a particular nuclear power plant specify that recy- cled ...

Problem-63: Testing Hypotheses: One Sample Tests

State inspectors, investigating charges that a Louisiana soft-drink bottling company underfills its ...

Problem-64: Testing Hypotheses: One Sample Tests

In 1995, the average 2-week-advance-purchase airfare between Raleigh-Durham, North Carolina, and New...

Problem-65: Testing Hypotheses: One Sample Tests

Audio Sounds runs a chain of stores selling stereo systems and components. It has been very successf...

Problem-66: Testing Hypotheses: One Sample Tests

The City of Oakley collects a 1.5 percent transfer tax on closed real estate transactions. In an ave...

Problem-67: Testing Hypotheses: One Sample Tests

In 1996, it was estimated that about 72 percent of all U.S. households were cable TV sub- scribers. ...

Problem-68: Testing Hypotheses: One Sample Tests

A company, recently criticized for not paying women as much as men working in the same positions, cl...

Problem-69: Testing Hypotheses: One Sample Tests

Drive-a-Lemon rents cars that are mechanically sound, but older than those rented by the large natio...

Problem-70: Testing Hypotheses: One Sample Tests

Assuming that the population is approximately normally distributed, is it reasonable to conclude, at...

Problem-71: Testing Hypotheses: One Sample Tests

In Exercise 8-26, what would be the power of the test for μ = $41.95, $42.95, and $43.95 if the sign...

Problem-72: Testing Hypotheses: One Sample Tests

The median number of children in U>S. households is 2. At a 10 percent significance level.Contact us...

Problem-73: Testing Hypotheses: One Sample Tests

Approximately 65 percent of all adults in the United States are3 married is the proportion of marrie...

Problem-74: Testing Hypotheses: One Sample Tests

Refer to Exercise 8-26. Compute the power of the test for μ = $41.95, $42.95, and $43.95.Contact us ...

Problem-75: Testing Hypotheses: One Sample Tests

A personnel manager believed that 18 percent of the company’s employees work overtime every week. If...

Problem-76: Testing Hypotheses: One Sample Tests

Refer to Exercise SC 8-5. Compute the power of the test for μ = 14,000, 13,500, and 13,000.Contact u...

Problem-77: Testing Hypotheses: One Sample Tests

A stockbroker claims that she can predict with 85 percent accuracy whether a stock’s market value wi...

Problem-78: Testing Hypotheses: One Sample Tests

A manufacturer of a vitamin supplement for newborns inserts a coupon for a free sample of its produc...

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