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Question: According to a study several years ago, the average BMW driver earns $82 600 per year. Suppose a researcher believes that the average annual earnings of a BMW driver are lower now, and he sets up a study in an attempt to prove his theory. He randomly samples 18 BMW drivers and finds out that the average annual salary for this sample is $78 974, with a population standard deviation of $7810. Use α = .01 to test the researcher's theory. Assume annual salaries are normally distributed.
Using the probability formulas, find the proportion of employees who either have MBAs or are managers.
The calculated chi-square test statistic and the table value for a 0.05 significance level are:
Can you please explain the 1.5 sigma shift they use in determining process sigma?
Forecasters interest rate predictions over the period 1982 1990 were studied to see whether the predictions corresponded to what actually happened.
The probability that an American CEO can transact business in a foreign language is 0.2. Ten American CEO's are chosen at random. b) what is the probability that at least two can transact business in a foreign language?
The National Center for Health Statistics indicate that 29.9% of a sample of men and 0.5% of a sample of women are 6" or taller. Are these results generally consistent with your calculations?
Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
Is there a relationship between the opinion and the location of the resident at a level of significance of 0.05?
Explain clearly what is meant by a false negative rate of 5% and a false positive rate of 15%. If the population were screened, what proportion would be expected to test negative for metropathy?
Height X of adult women are normally distributed with mean 63.7 inches and standard deviation 2.71 iches. Romeo who is 68.25 inches tall wishes to date only women who are shorter than he but within 4 inches of his height. Find the probability ..
What is them 98% confidence interval for the average number of minutes it takes to create a test question?
the research team thought that the life-cycle cost was related to the number of seats produced annually. to test
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