Testing Hypotheses: Two Sample Tests

Long Distance Carrier is trying to see the effect of offering “1 month free” with a monthly fi xed fee of $10.95, versus an offer of a low monthly fee $8.75 with no free month. To test which might be more attractive to consumers, Long Distance runs a brief market test: 12 phone reps make calls using one approach, and 10 use the other. The following number of customers agreed to switch from their present carrier to LDC: Offer Number of Switches 1 month free 118 115 122 99 106 125 102 100 92 103 113 129 Low monthly fee 115 126 113 110 135 102 124 137 108 128 Test at a signifi cance level of 10 percent whether there are signifi cant productivity differences with the two offers.

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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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