Science News (25 February 1995, p. 124) reported a study of 232 people, aged 55 or over, who had heart surgery. The patients were asked whether their religious beliefs give them feelings of strength and comfort and whether they regularly participate in social activities. Of those who said yes to both, about 1 in 50 died within 6 months after their operation. Of those who said no to both, about 1 in 5 died within 6 months after their operation. What is the relative risk of death (within 6 months) for the two groups? Write your answer in a sentence or two that would be understood by someone with no training in statistics.
Answer to relevant QuestionsThe headline in an article in the Sacramento Bee read “Firing someone? Risk of heart attack doubles” (Haney, 1998). The article explained that “between 1989 and 1994, doctors interviewed 791 working people who had just ...For each of the following situations, would a chi-square test based on a 232 table using a level of 0.01 be statistically significant? Justify your answer. a. chi-square statistic 5 1.42 b. chi-square statistic 5 14.2 c. ...In Exercise 12 of Chapter 12 results were given for a Roper Poll in which people were classified according to age and were asked if they had ever seen a ghost. The results from asking Minitab to compute the chi-square ...Refer to the previous exercise about the separation status of Australian couples. a. Find the expected counts for the table. b. Calculate the chi-square test statistic. c. Make a conclusion about whether there is a ...Refer to Table 8 on page 37 of Original Source 5 on the companion website. Notice that there is a footnote to the table that reads: “p,. 05 and p,. 01, based on chi-square test of association with sex.” The footnote ...
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