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Suppose in a study described in problem 9 each patient was also asked if the assigned medication caused any stomach upset. Among 50 patients 12 reported stomach upset with the experimental medication. Construct a 90% CI for the proportion of patients who experience stomach upset with the experimental medication. ( Problem 9 is a crossover trial. total of 50 patients are enrolled. the mean difference in times between the experiment is -9.4 minutes with a standard deviation of 2.8 minutes)
a. Construct a 90% CI for the proportion of patients who experience stomach upset with the experimental medication.
The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a defective calculator is 10%. What is the probability that 4 or more of the calculators will be defective?
You are the sales manager of a life insurance agency. All of your sales representatives are successful in selling a policy on 30% of their sales calls. Determine the probability of a sales representative's selling at least four policies if he (she..
The Martin Company is in the process of planning for new production facilities and developing a more efficient distribution system design. At present, it has one plant at St.Louis with a capacity of 30000 units.
Collapse the response categories in the following tables so that it meets the assumptions of the chi-square test; than perform the test.
Find the 95% confidence interval for the true population mean. Identify the point estimate for mean and margin of error.
A research study comparing college alcohol use in the United States and Canada reports that more Canadian students drink but American students drink more Is this study an example of an experiment? Explain why or why not.
Find the probability that in a given year a) exactly one major hurricane will strike the U.S. mainland, b) at most one major hurricane will strike the U.S. mainland.
The ACT is an exam used by colleges and universities to evaluate undergraduate applicants. The test scores are normally distributed. In a recent year, the mean test score was 21.1 and the standard deviation was 5.0.
Drug sniffing dogs must be 95% accurate. A new dog is being tested and is right in 46 of 50 trials. Find a 95% confidence interval for the proportion of times the dog will be correct.
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
Suppose we want to conduct a poll to estimate the proportion of voters who approve of the current mayor, and we plan to use a 95% confidence interval for our estimate.
Whenever the calculated value of t is equal to or greater than the tabled value of t, for a given number of degrees of freedom, then
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