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Consider the following dependent random samples Observations    1   2    3   4    5     6 x-values            8.1 7.6    8.3  8.4   7.9   7.0 y-values            8.4 8.4    8.5  8.9   8.1   7.6 a) Determine the difference between each set of points, xi – yi b) Do hypothesis testing to see if µd < 0 at the α = .025.

The marketing team at Beth’s Butter Works decided they preferred the traditional plastic tub packaging, but they wanted a more refined estimate of potential sales. They launched a third test at a regional level across 100 stores. These 100 stores had average daily sales of 140 units with a standard deviation of 50. Calculate the 99%, 95%, and 68% confidence intervals for the average number of units Beth’s Butter Works can anticipate to sell. Enter your results in the blanks below. There is a 99% likelihood that they will sell between  and units. There is a 95% likelihood that they will sell between  and units. There is a 68% likelihood […]

Suppose that you and a friend are playing cards and you decide to make a friendly wager. The bet is that you will draw two cards without replacement from a standard deck. If both cards are clubs, your friend will pay you $17

A city’s telephone book lists 100,000 people. If the telephone book is the frame for a study, how large would the sample size be if systematic sampling were done on every 200th person?

a manufacturer wants to increase the shelf life of a line of cake mixes. past records indicate that the average shelf life of the mix is 216 days. after a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (in days): 215, 217, 218, 219, 216, 217, 217, 218, and 218. using a= .025, has the shelf life of the cake mix increased?