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A recent analysis of census data suggests that married men have a higher median income than unmarried men (The Boston Globe, January 19,2010). Suppose the incomes (in $1,000s) of six married men and seven unmarried men produce the following representative results:
a. Set up the hypotheses to test the claim that the median income of married men is greater than the median income of unmarried men.
b. Calculate the value of the test statistic W.
c. With α = 0.05, what is the decision rule?
d. Is the claim supported by the data? Explain.
Use data to test independence of receiving/not-receiving aspirin and rates of stroke within 10 years. Show (i) assumptions, (ii) hypotheses, (iii) test statistic, (iv) p-value, (v) conclusion in the context of this study.
These predictions, however, are not very accurate. Discuss at least three reasons why these predictions may not be accurate and offer three ways in which you can increase the likelihood of accurately predicting your customers' purchases.
The weights of dormitory cockroaches follow a normal distribution. 14% of the dormitory cockroaches weigh below 77 grams and 10% of them weigh above 82 grams. Find the mean and standard deviation of their weights.
a non profit company concerned with the school dropout rates in a nearby state has designed a tutoring program aimed at
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a tire manufacturer wants to determine the inner diameter of a certain grade of tire. ideally the diameter would be
(a) Determine the test statistic. Show all work; writing the correct test statistic, without supporting work, will receive no credit.(b) Determine the P-value for this test. Show all work; writing the correct P-value, without supporting work, wi..
A sample of 148 of our statistics students rated their level of admiration for Hilary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06 and the standard deviation was 1.70.
an accounting firm has noticed that of the companies it audits 85 show no inventory shortages 10 show small inventory
Let α=0.05. What is your decision regarding the hypothesis? Write your conclusion in a sentence and discuss whether there is sufficient data to support your decision.
The "average" (mean) tire wore out at 41,000 miles, and the standard deviation was 4000 miles. Approximately what percent of the tires are likely to wear out before 40,200 miles?
Consider the joint pdf fX;Y (x; y) = 6y; for 0
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