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Gerstein (1965) studied the long-term pollution of Lake Michigan and its effect on the water supply for the city of Chicago. One of the measurements considered by Gerstein was the annual number of "odor periods" over the period of years 1950-1964. Table 8.8 contains this information for Lake Michigan for each of these 15 years.
Test the hypothesis that the degree of pollution (as measured by the number of odor periods) had not changed with time against the alternative that there was a general increasing trend in the pollution of Lake Michigan over the period 1950-1964. (See Comment 14)
Do you agree or disagree? Discuss briefly. Notes. "Baseline characteristics" are characteristics of subjects measured at the beginning of the study, i.e., just before randomization. The quote, slightly edited, is from Victora et al (2004).
elementary 201 766 148 218 519 396 274secondary 50 280 27 41 108
Complete a critical review of one research orientated journal article. This critique should demonstrate effective communication skills and understanding of the use of the statistical methods in the reported research.
Management wishes to test whether each shopper is spending an equal amount of money at each store. Calculate the sums of squares SS(total), SS(factor), and SS(error)
assume that the number of networks errors experienced in a day on a local area network lan is distributed as a poisson
a. Will the total revenue on a day be normally distributed? b. What are the mean and standard deviation of the total revenue on a particular day? c. What is the probability that the revenue will exceed $7,000 on a particular day?
lionel wants to play the crane machine arcade game the one with the mechanical claw to win a stuffed animal. he is good
Suppose the federal government proposes to give a substantial tax break to automakers producing midsize cars that get a mean mileage exceeding 31 mpg.
a doctor is trying to determine whether her patients prefer a male nurse or a female nurse. after asking 25 male
In a certain state, an appeals court consists of seven judges. For a routine case, three judges are chosen at random as a panel to hear a case and render a decision. How many distinct panels can be formed?
Write a brief introductory paragraph regarding the background of data and write paragraph (or two) that specifies the shape of the distribution of the data and reference your graph(s) used to make your decision.
a hospital conducted a study of waiting time in its emergencyroom. the hospital has a main campus and three satellite
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