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To determine the health benefits of walking, researchers conduct a study in which they compare the cholesterol levels of women who walk at least 10 miles per week to those of women who do not exercise at all. The study finds that the average cholesterol level for the walkers is 198, and that the level for those who don't exercise is 223. Which of the following statements is true?
I. This study provides good evidence that walking is effective in controlling cholesterol.
II. This is an observational study, not an experiment.
III. Although the study was conducted only on women, we can confidently generalize the results to men in the same age group.
A. I only
B. II only
C. III only
D. II and III only
E. I and III only
laptop use in middle school. refer to the american secondary education fall 2009 study of middle school students usage
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Her mean waiting time was 7.4 minutes. Assume that the standard deviation has been historically known to be 2.2 minutes. At the .05 significance level, test the claim that the mean waiting time is less than 10 minutes.
a researcher would like to evaluate the effectiveness of a pain-relief patch designed for lower back pain. prior to
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Costs of Television: Listed below are prices (in dollars) and quality rating scores of rear-projection televisions. All of the televisions have screen sizes of 55 or 56 inches.
70 people received a higher score on the second test, 13 a lower score, and 1 received the same score. At the 0.05 significance level, test the claim that the music has no effect on memorization skills.
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