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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.
By using standard normal table, determine critical value (or values) for= 0.14 right-tailed test.
Discuss how to perform a test of hypothesis to determine whether the variances of two populations are equal. Include a discusssion of why the larger sample variance is placed in the numerator in the Test Statistic for comparing two variances.
That's a much larger sample than standard sample surveys. In spite of this, we can't trust the result to give good information about any clearly defined population. Why?
If you wish to estimate a population mean with a sampling distribution error SE = 0.28 using a 95% confidence interval and you know from prior sampling that sigma^2 is approximately equal to 5.4, how many observations would have to be included in ..
You do not need to collect data and actually conduct the test calculations. Rather,state the claim, define the null and alternate hypotheses, identify the test significance and the test statistic, and state the decision rule that will be used.
With a sample standard deviation of 200 pounds. We know the sample is from a normal distribution. The 95% confidence interval of the true mean is?
Choose a new car or light truck at random and note its color. Here are the probabilities of the most popular colors for vehicles. Choose two vehicles at random. What is the probability that both are silver or both are white?
Use the normal approximation to estimate the probability of at least one disaster in 25 missions.
A summary of data (deposits in thousands of dollars) from the survey is as follows: First National 1 = 4.1, σ1 = 1.2; City National 2 = 3.5, σ2 = 0.9. Use a 98% confidence interval to estimate the difference in the mean weekly deposits into IRAs f..
Average performance evaluation is higher for managers hired from outside firm compared with those promoted from within? What other stories does this graph tell?
Does this sample give sufficient evidence to conclude that self-esteem scores for group-participation adolescents are significantly different from those of general population? Use two-tailed test with α = .01.
A sample of twenty automobiles was taken, and the miles per gallon (MPG), horsepower, and total weight were recorded. Develop a linear regression model to predict MPG using horsepower as the only independent variable. Develop another model with weig..
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