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Remember to pay attention to the p-value for the overall F. When removing variables from a regression, it is extremely important to remove them one at a time, since p-values can change dramatically when a variable is removed. Later, we"ll discuss a method called "backward" elimination for determining which variables to include in your final model. What about the coefficients?
Would the null hypothesis be accepted or rejected in this case?
Would you conclude that your data set is approximately normal? If so, what percentage of your data values lie:
A researcher is using a chi-square test to determine whether there are any preferences among four brands of cola. With alpha = .05 and a sample of n = 30, what is the boundary for the critical region for the hypothesis test.
Give the Z score for person who scores (a) 340, (b) 310, and (c) 260. Give the raw scores for persons whose Z score on this test are (d) 2.4, (e) 1.5, (f) o, and (g) -4.5
In Colorado Springs the newspaper runs mug shots of wanted criminals. The 17% of those published are arrested through information provided to the police. If 200 are published, find the probability that less than 30 are arrested.
A portfolio manager believes that tomorrow's foreign exchange rate of German marks per US dollar will be Normally distributed with mean 2.03 and standard deviation 0.08. Using the manager's numbers:
Does there seem to be any difference in the effects of the antibiotics on clearance of otitis media? Express your results in terms of relative risk (RR). Consider separated analyses for unilateral and bilateral cases. Also consider and analysis co..
The management of a bank in the Caribbean was concerned about the potential loss that might occur in the event of a hurricane. The bank estimated that the loss from one of these storms could be as much as $100 million including losses due to inter..
What is the mean of this uniform distribution? What is the standard deviation?
Rhe frequency distribution summarizes a sample of times (in minutes) between eruptions of a cretain geyser. Find the approximate population mean and approximate population standard deviation of the data.
Many people attend work and produce little or nothing of value that is why they are terminated.
a. How many of the individuals selected in your sample are female? b. How is the stratified sample different from the SRS?
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