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Question: The average amount of time that visitors spent looking at a retail company's old home page on the world wide web was 23.6 seconds. The company commissions a new home page. On its first day in place the mean time spent at the new page by 7,628 visitors was 23.5 seconds with standard deviation 5.1 seconds.
a. Test at the 5% level of significance whether the mean visit time for the new page is less than the former mean of 23.6 seconds, using the critical value approach.
b. Compute the observed significance of the test.
c. Perform the test at the 5% level of significance using the p-value approach. You need not repeat the first three steps, already done in part (a).
It is very possible that when you use a correlation matrix as input to the RISKCORRMAT function in an @RISK model, the program will inform you.
Refer to the Real estate data set in Appendix C.7 and Case Study 9.31. For the best subset model developed in Case Study 9.31, perform appropriate diagnostic checks to evaluate outliers and assess their influence. Do any serious multicollinearity ..
a) Set up the null and alternative hypotheses, and perform the hypothesis test. b) Based on these results, does the diet appear to be effective? Does the diet appear to have practical significance?
Translate the following statements into symbolic form using capital letters to represent affirmative English statements.- Tommy Hilfiger celebrates casual if and only if neither Ralph Lauren nor Calvin Klein offers street chic.
Write a few sentences describing the similarities and differences in brand preferences among eighth graders in the two regions listed.
A certain amateur golfer hits his tee shot on average a distance of 230 yards with a standard deviation of 52.6 yards. He practices on the driving range, hitting 49 tee shots.
Consider a binomial distribution with 15 identical trials, and a probability of success of 0.5. Use the normal approximation to find the probability that x = 2.
The producer of a TV special expected about 40 percent of the viewing audience to watch a rerun of a 1965 Beatles Concert. A sample of 200 homes revealed 60 to be watching the concert.
Now find the appropriate center line and control limits for an x chart, make the x‾ chart, and comment on control.
The animal colony in the reseach department contains 20 male rats and 30 female rats. Of the 20 males, 15 are white and 5 spotted. Of the 30 females, 15 are white, and 15 are spotted.
Describe the new risks facing society today. Give examples of risks in electronic commerce.
data regarding voter turnout in five cities was collected. you find the following unstandardized multiple regression
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