Testing Hypotheses: Two Sample Tests

In September 1995, the Automobile Confederation of the Carolinas surveyed 75 randomly chosen service stations in North and South Carolina and determined that the average price for regular unleaded gasoline at self-service pumps was $1.059, and the sample standard deviation was 3.9¢. Three months later, another survey of 50 service stations found an average price of $1.089, and the sample standard deviation was 6.8¢. At α = 0.02, had the Carolinas’ average price of self-service regular unleaded gasoline changed signifi cantly in this 3-month period?

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Problems: Testing Hypotheses: Two Sample Tests

Problem-01: Testing Hypotheses: Two Sample Tests

Two independent samples of observations were collected. For the fi rst sample of 60 elements, the me...

Problem-02: Testing Hypotheses: Two Sample Tests

In 1993, the Financial Accounting Standards Board (FASB) was considering a proposal to require comp...

Problem-03: Testing Hypotheses: Two Sample Tests

Two independent samples were collec ted. For the fi rst sample of 42 items, the mean was 32.3 and t...

Problem-04: Testing Hypotheses: Two Sample Tests

Block Enterprises, a manufacturer of chip s for computers, is in the process of deciding whether to ...

Problem-05: Testing Hypotheses: Two Sample Tests

Two research laboratories have independently produced drugs that provide relief to arthritis suffere...

Problem-06: Testing Hypotheses: Two Sample Tests

A sample of 32 money-market mutual funds was chosen on January 1, 1996, and the average annual rate ...

Problem-07: Testing Hypotheses: Two Sample Tests

In September 1995, the Automobile Confederation of the Carolinas surveyed 75 randomly chosen service...

Problem-08: Testing Hypotheses: Two Sample Tests

Notwithstanding the Equal Pay Act of 1963, in 1993 it still appeared that men earned more than women...

Problem-09: Testing Hypotheses: Two Sample Tests

BullsEye Discount store has always prided itself on customer service. The store hopes that all Bulls...

Problem-10: Testing Hypotheses: Two Sample Tests

consumer-research organization routinely selects several car models each year and evaluates their f...

Problem-11: Testing Hypotheses: Two Sample Tests

Connie Rodrigues, the Dean of Students at Midstate College, is wondering about grade distributions a...

Problem-12: Testing Hypotheses: Two Sample Tests

A credit-insurance organization has developed a new high-tech method of training new sales personnel...

Problem-13: Testing Hypotheses: Two Sample Tests

A large stock-brokerage fi rm wants to determine how successful its new account executives have been...

Problem-14: Testing Hypotheses: Two Sample Tests

To celebrate their fi rst anniversary, Randy Nelson decided to buy a pair of diamond earrings for hi...

Problem-15: Testing Hypotheses: Two Sample Tests

A sample of 30-year conventional mortgage rates at 11 randomly chosen banks in California yielded a ...

Problem-16: Testing Hypotheses: Two Sample Tests

Because refunds are paid more quickly on tax returns that are fi led electronically, the Commissione...

Problem-17: Testing Hypotheses: Two Sample Tests

Greatyear tires currently produces tires at their Wilmington, North Carolina plant during two 12-hou...

Problem-18: Testing Hypotheses: Two Sample Tests

Sherri Welch is a quality control engineer with the windshield wiper manufacturing division of Emsco...

Problem-19: Testing Hypotheses: Two Sample Tests

Nine computer-components dealers in major metropolitan areas were asked for their prices on two sim...

Problem-20: Testing Hypotheses: Two Sample Tests

The data below are a random sample of 9 firms chosen from the “Digest of Earnings Reports” in The Wa...

Problem-21: Testing Hypotheses: Two Sample Tests

Jeff Richardson, the receiving clerk for a chemical-products distributor, is faced with the continui...

Problem-22: Testing Hypotheses: Two Sample Tests

Additives-R-Us has developed an additive to improve fuel effi ciency for trucks that pull very heavy...

Problem-23: Testing Hypotheses: Two Sample Tests

Aquarius Health Club has been advertising a rigorous program for body conditioning. The club claims ...

Problem-24: Testing Hypotheses: Two Sample Tests)

Donna Rose is a production supervisor on the disk-drive assembly line at Winchester Technologies. Wi...

Problem-25: Testing Hypotheses: Two Sample Tests)

Modems transmit information across telephone lines from one computer to another. Their speed is rate...

Problem-26: Testing Hypotheses: Two Sample Tests)

A large hotel chain is trying to decide whether to convert more of its rooms to nonsmoking rooms. In...

Problem-27: Testing Hypotheses: Two Sample Tests)

Two different areas of a large eastern city are being considered as sites for day-care centers. Of 2...

Problem-28: Testing Hypotheses: Two Sample Tests)

On Friday, 11 stocks in a rand om sample of 40 of the roughly 2,500 stocks traded on the New York St...

Problem-29: Testing Hypotheses: Two Sample Tests)

MacroSwift has recently released a new word-processing product, and they are interested in determini...

Problem-30: Testing Hypotheses: Two Sample Tests)

A coal-fi red power plant is considering two different systems for pollution abatement. The fi rst s...

Problem-31: Testing Hypotheses: Two Sample Tests)

A group of clinical physicians is performing tests on patients to determine the effectiveness of a n...

Problem-32: Testing Hypotheses: Two Sample Tests)

The University Bookstore is facing signifi cant competition from off-campus bookstores, and they are...

Problem-33: Testing Hypotheses: Two Sample Tests

In preparation for contract-renewal negotiations, the United Manufacturing Workers surveyed its memb...

Problem-34: Testing Hypotheses: Two Sample Tests

The Coffee Institute has claimed that more than 40 percent of American adults regularly have a cup o...

Problem-35: Testing Hypotheses: Two Sample Tests

Approximately what is the prob value for the test in Self-Check Exercise 9-3 on page 448? Contact u...

Problem-36: Testing Hypotheses: Two Sample Tests

A car retailer thinks that a 40,000-mile claim for tire life b y the manufacturer is too high. She c...

Problem-37: Testing Hypotheses: Two Sample Tests

The North Carolina Department of Transportation has claimed that at most, 18 percent of passenger ca...

Problem-38: Testing Hypotheses: Two Sample Tests

Kelly’s machine shop uses a machine-controlled metal saw to cut sections of tubing used in pressure-...

Problem-39: Testing Hypotheses: Two Sample Tests

SAT Services advertises that 80 percent of the time, its preparatory course will increase an individ...

Problem-40: Testing Hypotheses: Two Sample Tests

Clic Pens has tested two types of point-of-purchase displays for its new erasable pen. A shelf displ...

Problem-41: Testing Hypotheses: Two Sample Tests

In 1992, a survey of 50 municipal hospitals revealed an average occupancy rate of 73.6 percent, and ...

Problem-42: Testing Hypotheses: Two Sample Tests

General Cereals has just concluded a new advertising campaign for Fruit Crunch, its allnatural break...

Problem-43: Testing Hypotheses: Two Sample Tests

Ben & Jerry's Homemade, inc. is an unconventional manufacturer of super-premium ice cream known for ...

Problem-44: Testing Hypotheses: Two Sample Tests

Students Against Drunk Driving has targeted seat-belt usage as a positive step to reduce accidents a...

Problem-45: Testing Hypotheses: Two Sample Tests

Allen Distributing Company hypothesizes that a phone call is more effective than a letter in speedin...

Problem-46: Testing Hypotheses: Two Sample Tests

A buffered aspirin recently lost some of its market share to a new competitor. The competitor advert...

Problem-47: Testing Hypotheses: Two Sample Tests

Consider the data at the top of page 500. In the first three months of 1993, sales of luxury cary ca...

Problem-48: Testing Hypotheses: Two Sample Tests

A chemist developing insect repellents wishes to know whether a newly developed formula gives greate...

Problem-49: Testing Hypotheses: Two Sample Tests

Long Distance Carrier is trying to see the effect of offering “1 month free” with a monthly fi xed f...

Problem-50: Testing Hypotheses: Two Sample Tests

Is the perceived level of responsibility for an action related to the severity of its consequences? ...

Problem-51: Testing Hypotheses: Two Sample Tests

In October 1992, a survey of 120 macroeconomists found 87 who believed that the recession had alread...

Problem-52: Testing Hypotheses: Two Sample Tests

Full length feature films earn huge profits for entertainment giant The Walt Disney Company. Hit mov...

Problem-53: Testing Hypotheses: Two Sample Tests

The MBA program at Piedmont Business School offers Analytic Skills Workshop (ASW) during the summer ...

Problem-54: Testing Hypotheses: Two Sample Tests

Fifty-eight of 2,000 randomly sampled corporations had their 1995 federal income tax returns audited...

Problem-55: Testing Hypotheses: Two Sample Tests

Ellen Singer asserted to one of her colleagues at Triangle Realty that homes in southern Durham Coun...

Problem-56: Testing Hypotheses: Two Sample Tests

The Dow-Jones Transportation Average is based on the closing prices of the common stocks of 20 airli...

Problem-57: Testing Hypotheses: Two Sample Tests

TV network executive Terri Black has just received a proposal and a pilot tape for a new show. Empty...

Problem-58: Testing Hypotheses: Two Sample Tests

A manufacturer of pet foods was wondering whether cat owners and dog owners reacted differently to p...

Problem-59: Testing Hypotheses: Two Sample Tests

Robin Wendell has been offered a transfer from Pittsburgh to Boston, but is holding out for more mon...

Problem-60: Testing Hypotheses: Two Sample Tests

A group of British Physicians replicated a U.S. management survey of medical directors, asking which...

Problem-61: Testing Hypotheses: Two Sample Tests

A firm is considering offering new-hire MBAs a housing allowance to compensate for differences in th...

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