The news story quoted in Exercise 9 also stated that “frequent exercisers had slight or no increased risk.” (In other words, frequent exercisers had slight or no increased risk of heart attack when they took on a strenuous activity compared with when they didn’t.) Do you think that means the relative risk was actually 1.0? If not, discuss what the statement really does mean in the con-text of what you have learned in this chapter.
Answer to relevant QuestionsWe have learned that the probability of making a type 1 error when the null hypothesis is true is usually set at 5%. The probability of making a type 2 error when the alternative hypothesis is true is harder to find. Do you ...Refer to the list of warnings on pages 527–528. Explain which ones should be of concern if the sample size(s) for a test are small. From this discussion, you should realize that you can’t simply rely on news reports to ...In Original Source 1, the researchers addressed some limitations with the study. One of them was: First, there was a relatively small number of subjects who participated and this limited our statistical power. A number of ...In reporting the results of a study to compare two population means, explain why researchers should report each of the following: a. A confidence interval for the difference in the means. b. A p-value for the results of the ...When the Cochrane Collaboration (discussed on page 537) was first getting started, a report in New Scientist (Vine, 21 January 1995), announced that the UK Cochrane Centre in Oxford would be launching the Cochrane Database ...
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