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You are a water quality tester, working for the EPA. You are testing the water in a stream just below the point where a major manufacturing company
We have now studied two statistics Z and t. Compare and contrast the use of these two statistical tests, with particular attention to the quantity and quality
A random sample of 25 SUV's of the same year and model revealed the following miles per gallon (mpg) values:
The Environmental Protection Agency (EPA) estimated that the, on average, 1994 Polaris automobile obtains a 35 miles per gallon (mpg) on the highway
At one time, the theory of biorhythms was very popular. The theory behind it is that our lives are affected by three primary cycles
It is often stated in three-shift manufacturing organizations that the quality of work on the second shift is worse than on the first
A researcher wishes to try three different techniques to lower blood pressure of individuals diagnosed with high blood pressure.
Tiedke's Department Store accepts three types of credit cards, MasterCard, Visa, and their own store card. The sales manager is interested in finding
Determine whether the block or the treatment means differ. Using the 0.05 significance level: a) state the null and alternate hypotheses for treatments;
Vehicles heading west on Front Street may turn right, left, or go straight ahead at Elm Street. The city traffic engineer believes that half of the vehicles
A sample of employees at a large chemical plant was asked to indicate a preference for one of three pension plans. The results are given in the following table
One reads that a business school graduate with an undergraduate degree earns more than a high school graduate with no additional education
Indicate the statistical test, the degrees of freedom, the level of significance, the region of rejection, the critical value, the calculated value of the test
A psychology researcher who does work in creativity wants to determine whether her sample of 50-year-old adults (N = 150) differs statistically
Twenty sets of depressed twins are obtained for a study on the effects of a new antidepressant. In each twin set, one twin is assigned to receive the drug
Researchers who are interested in schizophrenia examined 15 pairs of identical twins, where one twin was schizophrenic ("affected") and the other was not
A market research consultant hired by the Pepsi-Cola Co is interested in determining whether there is a difference between the portions of female and male
At a food processing plant, a machine produces 10 lb bags of sugar. In this particular process, it is important that the sugar content does not go below 9.9 lbs
An insurance company states that 90% of its claims are settled with 5 weeks. A consumer group selected a random sample of 100 of the company's claims
Choose a variable. Before collecting the data, decide what a likely average might be, then complete the following:
Quarterly customer surveys are taken at a medical center. Each individual department has scores and is comparted to the medical center average
The mean age of bus drivers in Chicago is 54.5 years. If a hypothesis test is performed, how should you interpret a decision that fail to rejects the null
In a recent study, a researcher found that there is a negative correlation (r = -0.67) between changing your first answer on a standardized achievement test
The end of the year can be a time of rejoicing, a time of business, and a time of confusion. For most employers, it is a time to conduct open enrollment
The liquid chlorine added to swimming pools to combat algae has a relatively short shelf life before it loses its effectiveness