A survey of 100 cigarette smokers showed that 71 were loyal to one brand, compared to 122 of 200 toothpaste users. Construct a 90 percent confidence interval for the difference in proportions.
Answer to relevant QuestionsWhich samples show unequal variances? Use α = .10 in all tests. Show the critical values and degrees of freedom clearly and illustrate the decision rule. a. s1 = 10.2, n1 = 22, s2 = 6.4, n2 = 16, two-tailed test b. s1 = ...Examine the data below showing the weights (in pounds) of randomly selected checked bags for an airline's fights on the same day. (a) At α = .05, is the mean weight of an international bag greater? Show the hypotheses, ...How many full-page advertisements are found in a magazine? In an October issue of Muscle and Fitness, there were 252 ads, of which 97 were full-page. For the same month, the magazine Glamour had 342 ads, of which 167 were ...A study revealed that the 30-day readmission rate was 31.4 percent for 370 patients who received after-hospital care instructions (e.g., how to take their medications) compared to a readmission rate of 45.1 percent for 368 ...Based on the sample data below, is the average Medicare spending in the northern region significantly less than the average spending in the southern region at the 1 percent level? (a) State the hypotheses and decision ...
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