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Refer to Grocery retailer Problem 6.9. The observations are listed in time order. Assume that regression model (12.2) is appropriate. Test whether or not positive autocorrelation is present; use α = .05. State the alternatives, decision rule, and conclusion
Problem 6.9
Grocery retailer. A large, national grocery retailer tracks productivity and costs of its facilities closely. Data below were obtained from a single distribution center for a one-year period. Each data point for each variable represents one week of activity. The variables included are the number of cases shipped (XI)' the indirect costs of the total labor hours as a percentage (X2), a qualitative predictor called holiday that is coded 1 if the week has a holiday and 0 otherwise (X3), and the total labor hours (Y).
a. Prepare separate stem-and-leaf plots for the number of cases shipped Xit and the indirect cost of the total hours Xi2. Are there any outlying cases present? Are there any gaps in the data?
b. The cases are given in consecutive weeks. Prepare a time plot for each predictor variable. - What do the plots show?
c. Obtain the scatter plot matrix and the correlation matrix. What information do these diagnostic aids provide here?
For events A and B, Pr(A intersection B) = p, Pr(A' intersection B) = P - 1/8 and Pr(A intersection B') = 3p/5. If A and B are independent, then the value of p is ___.
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Find at least what % of the weights are within xbar ± 3.5s - pounds of a sample of high school football players.
A political analyst was interested in the proportion C of individuals who would vote for a controversial ballot measure. While he thought that it would be a close call, he was un sure of the precise value for C. He assessed a beta distribution for..
From the fourth quarter of 1997 to the first quarter of 1998, revenues declined. What happened on a seasonally adjusted basis? From the first quarter of 1998 to the second quarter of 1998, revenues increased. What happened on a seasonally adjusted ba..
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p-value.
Suppose the going rate for this procedure by other plumbing shops in the area is $85.00, not including the cost of the new equipment. If No Leak bids the disposal job at $85, on what percentage of such jobs will the actual time required exceed the ..
the admissions staff asked graduates outside their immediate area and outside the state to help with recruiting. in
find the linear correlation coefficiet between cumulative gpa and high school percentile for the 200 uwec undergraduate
a. Find the standardized score (z-score), relative to all U.S. births. for a baby with a birth length of 45 cm. b. Find the standardized score of a birth length of 45 cm for babies born one month early, using 47.4 as the mean.
How many classes would you suggest? What is the most suitable class interval? What is the lower limit of the initial class? Create the frequency distribution. Describe the profile of the distribution.
Test the hypothesis that the birthweight is independent of whether or not the baby survives its first year.
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