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To test the hypothesis that students who finish an exam first get better grades, a professor kept track of the order in which paper were handed in
Does lovastatin reduce the risk of heart attack? Researchers gave lovastatin to 2,325 people and an placebo to 2,081 people
What do we use the F Distribution to test? Provide an example from your place of employment or circle of influence of an instance when you could use the F
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead.
A recent article in the Topeka Times reported that 40% of all farms in Kansas will have financial problems this year
A trucking firm suspects that the mean lifetime of a certain tire uses is less than 35,000miles. To check the claim the firm randomly selects and tests
In the following regression, X=total assets ($ billions), Y=total revenue ($ billions), and n=64 large banks.
An attempt was made to evaluate the inflation rate as a predictor of the spot rate in the German treasury bill market. For a sample of 29 quarterly observations
The retailing manager of a supermarket chain wants to determine whether product location has any effect on the sale of pet toys.
A newspaper article discussed the opening of a Whole Foods Market in the Time-Warner building in New York City.
Last year the records of Dairy Land Inc., a convenience store chain, showed the mean amount spent by a customer was $30
In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348
A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces.
The company believes that it averages about the same weight per bag in each of two production lines
A company is filling bags of rock salt to a level of 50 pounds. It believes that all bags are filled correctly, but would like to use a hypothesis test
The producer of a TV special expected about 40 percent of the viewing audience to watch a rerun of a 1965 Beatles Concert.
Would like each student in the class to go to the market and purchase 10 bags of M&M regular size candy.
On eight Friday quizzes, Bob received scores of 80, 85, 95, 92, 89, 84, 90, 92. He tells Prof. Hardtack that he is really a 90+ performer
Calculate the test statistic and p-value for each sample.
The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants is randomly selected and their weights
Create a research question for one of the following groups: students, children or women. Include the independent and dependent variables you would study
A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on the average, 10 pounds the first two weeks
The mean shopping time for women with kids is 7.3 minutes. A random sample of women with children in a shopping store gave the following shopping times
Are females more likely to develop high blood pressure than males?
The value of the z-score that is obtained for a hypothesis test is influence by several factors. Some factors influence the size of the numerator