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Imagine the two researchers independently carry out clinical trials to test the same null hypothesis, that COX-2 selective inhibitors (which are used to treat arthritis ) have no affect on the risk of cardiac arrest. They use the same population for their study, but one experimenter uses a sample size of 60 subjects, whereas the other uses a sample size of 100. Assume that all other aspects of the studies, including significance levels, are the same between the two studies.
a) Which study has the higher probability of a Type II error, the 60-subject study or the 100 -subject study?b) Which study has higher power?c) Which study has the higher probability of Type I error?d) Should the tests be one-tailed or two-tailed? Explain?
Random number generation based on discrete distribution and evaluate the average queue length, waiting time, and percentage utilization for each system.
A random group of students was selected from a large student conference to analyze their class in school. Is there evidence to reject the hypothesis that the number of students is equally distributed between the four classes, at alpha = .05?
The standard deviation of is usually called the A. randomized standard error B. standard error of the sample C. standard error of the population D. standard error of the mean
For the following independent random samples, use the z-test and the 0.01 level of significance in testing Ho:u1 = u2 versus H1:u1 = u2.
A recent study stated that if a person chewed gum, the average number of sticks of gum he or she chewed daily was 8. To test the claim, a researcher selected a random sample of 36 gum chewers and found the mean number of sticks of gum chewed per d..
An automobile assembly line operation has a scheduled mean completion time,u , of 13.5 minutes. The standard deviation of completion times is 1.7 minutes.
What sample size is necessary for a study to determine the average cost of a child delivered at a local hospital within the past three months?
If a class of 30 students is chosen at random from the university population, find the mean and variance of the number of male students.
mean is calculated for each sample, then the average distance between M and u would be:
I need to collect both primary and secondary data regarding the research issue on salary of baseball players. (the aim of this research is to verify whether the salary of the baseball players varies with respect to the state)
Suppose a machine is worth 33000 after 4 years and 18000 after 8. Find the rate of depreciation using the linear depreciation method
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
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