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1. An accountant wants to test the hypothesis that the proportion of incorrect transactions at four client accounts is about the same. A random sample of 80 transactions of one client reveals that 21 are incorrect; for the second client, the sample pro- portion is 25 out of 100; for the third client, the proportion is 30 out of 90 sampled; and for the fourth, 40 are incorrect out of a sample of 110. Conduct the test at CY = 0.05.
2. An article in Business Week describes how three online news services now supply Web surfers quick information on developing stories.20 Suppose that a ran- dom sample of users is available from various parts of the country. Data are shown in the table below. Is there evidence that the three Web news services have different success rates at different regions of the country?
Google News
Northeast
78
South
15
West
109
Midwest
65
PBS Online
115
10
88
50
New York Times
208
3
52
40
Solve the equations using linear algebra
The following data were obtained in an experiment to estimate a possible relation between the number of showings in one week of a TV commercial in typical sales territories and the sales (in thousands of units) in that territory of the advertised ..
What is the probability that in any particular cookie being inspected five or more chip parts will be found if the mean number of chip parts per cookie is 6.3.
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Briefly describe the statistical analyses used
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An important issue facing Americans is the large number of medical malpractice lawsuits and the expenses that they generate. In a study of 1228 randomly selected medical malpractice lawsuits
Express the probability as a decimal
suppose that for a certain caribbean island in any 3-year period the probability of a major hurricane is .25 the
In one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean of 1050 kWh and a standard deviation of 218 kWh. Find P45, which is the consumption level separating the bottom 45% from t..
we calculate a statistical power and find that it is 0.93. this means that if the null hypothesis is we have a chance
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