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Nationally the proportion of American households with income above $100,000 is 10%. A researcher in State of California finds that out of a sample of 300
A retail store manager is trying to estimate the average purchase transaction amount for a particular store.
Various types of retail outlets sell toys during the holiday season. Among them are specialty toy stores, the large discount toy stores, and other retailers
The normal serum hemocrit level is 0.41 milligrams to 100 milligrams of blood. The level in elderly patients is significantly low at 0.31. 25 patients
Persistant low hemocrit in all the elderly patients in a nursing home f .31, with a normal of .41. an intervention program of an iron supplement
According to the U.S. Bureau of Labor Statistics (http://www.bls.gov), the average hourly wage in the manufacturing sector in 2000 was $19.86 in the US
A manufacturer of computer chips claims that more than 90% of his products conform to specifications. in a random sample of 1000 chips drawn
In deciding upon the appropriate premium to charge, insurance companies sometimes use the exponential principle, defined as follows
Does gender impact the use of electronic mail (e-mail)? An insurance company studied the use of e-mail in its organization by counting the number of business
The New York Stock Exchange (NYSE) consists of listing of approximately 1,500 companies, which offer shares of company stock to the public
For the statement: The mean amount of Pepsi in cans is at least 12 oz. Express the null hypothesis and the alternative hypothesis in symbolic form.
M&M/Mars claims that at least 20% of the M&M's in each package are the new blue color. Set up the null and alternate hypotheses to test this claim.
Attitude change is thought to result from the anxiety produced under conditions of cognitive dissonance. The data below represent the anxiety scores of subjects
Assume that male snakes of a particular species are all scaled versions of the same basic shape.
A U.S. Travel Data Center survey of 1500 adults found that 42% of respondents stated that they favor historical sites as vacations.
Sample data were collected in a study of calcium supplements and their effects on blood pressure. A placebo group and a calcium group began the study
21st Century Insurance Company claims that telephone calls for policy holder information are answered in at most 3 minutes.
A vendor supplies refreshments at a baseball stadium and must plan for the possibility of a World Series contest.
A diaper company is considering 3 different filler materials for their disposable diapers. Eight diapers were tested with each of the 3 filler materials and 24
A company that depends heavily on advertising for selling its products wants to know if its various advertising media have different effectiveness
A sports-shoe manufacturer claims that joggers who wear its brand of shoe will jog faster than those who don't
A statistician claims that the average score on a standardized test of students who major in psychology is greater than the average of students
From past records, a hospital found that 37% of all full-term babies born in the hospital weighed more than 7 pounds 2 ounces.
Many new stockbrokers resist giving presentations to bankers and certain other groups.
There are 4 entrances to a building in Philadelphia. The bldg maintenance super would like to know if the entrances are equally utilized.