Refer to Exercise 6.37.
Suppose that the agency sponsoring the study specifies that the group receiving the drug should have twice as many patients as the placebo group. Determine the sample sizes necessary for an α = .05 t test to have a power of .80 to detect an increase of 5 mm Hg in the blood pressure of the treatment group relative to that of the placebo group.
Answer to relevant QuestionsThe researchers also need to obtain precise estimates of the mean difference in systolic blood pressures for people who use the anti-inflammatory drug versus those who do not. a. Suppose the sample sizes are the same for ...An entomologist is investigating which of two fumigants, F1 or F2, is more effective in controlling parasities in tobacco plants. To compare the fumigants, nine fields of differing soil characteristics, drainage, and amount ...Refer to Exercise 6.50. a. Compare the mean drops in blood pressure for the low-dose group and the control group. Use α = .05 and report the level of significance. b. Estimate the size of the difference in the mean drops ...Company officials are concerned about the length of time a particular drug retains its potency. A random sample (sample 1) of 10 bottles of the product is drawn from current production and analyzed for potency. A second ...Analyzing Data, the Interpreting the Analyses, and Communicating the Results (4). A paired t test for the difference data in Exercise 6.67 is shown here. The p-value in the output reads .000, which means that it is smaller ...
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