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A particular brand of dishwasher soap is sold in three sizes: 30 oz, 45 oz, and 65 oz. Twenty percent of all purchasers select a 30-oz box, 50% select a 45-oz box, and the remaining 30% choose a 65-oz box. Let X1 and X2 denote the package sizes selected by two independently selected purchasers.
(a) Determine the sampling distribution of X. x 30 37.5 45 47.5 55 65 p(x) Calculate E(X). E(X) = oz Compare E(X) to µ. E(X) > µ E(X) < µ E(X) = µ.
(b) Determine the sampling distribution of the sample variance S2. s2 0 112.5 200 612.5 p(s2) Calculate E(S2). E(S2) = Compare E(S2) to s2. E(S2) < s2 E(S2) = s2 E(S2) > s2.
explain the difference between qualitative quantitative discrete and continuous
Although there is a popular belief that herbal remedies such as ginkgo biloba and ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research.
Suppose that the researcher from the previous problem repeated the study of married couples' initials using twice as many participants and obtaining observed frequencies that exactly double the original values. The resulting data are as follows:
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an aeroplane flies from a to b at the rate of 500kmhr and comes back from b to a at the rate of 700kmhr. what is the
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At the 10% level of significance, is there sufficient evidence to indicate that more books are being loaned out per day, on the average?
If the weekly average expenditure of all households is $53,000 but an expert argues that the weekly expenditure is more than $53,000, test his claim at a 5% level of significance and interpret your results.
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