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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.
All of the following are possible hypotheses surrounding nominal data except:
Given a two-tail test for the population mean, the null hypothesis contains a(n) __________ sign, and the alternative hypothesis contains a(n) ___________ sign.
For any hypothesis test, if the value of a parameter being tested falls outside the confidence interval for the same level of a, the correct decision
The educational testing service (ETS) designs and administers the SAT exams. Recently the format of the exam changed and the claim has been made
In an attempt to improve quality many manufacturers are developing partnerships with their suppliers.
An automobile company thinks that with new designs, it scars will last longer before having a problem. For this reason the company wishes to extend the warranty