Refer to Example 10 on whether arthroscopic surgery is better than placebo. The following table shows the pain scores one year after surgery. Using software (such as MINITAB) that can conduct analyses using summary statistics, compare the placebo to the debridement group using a 95% confidence interval. Use the method that assumes equal population standard deviations. Explain how to interpret the interval found using software.
Answer to relevant QuestionsIn the study of binge drinking mentioned in Exercise 10.3, the percent who said they had engaged in unplanned sexual activities because of drinking alcohol was 30.7% in 1999 and 23.0% in 2009. Is this change statistically ...A study followed patients for four years after they had a heart attack (K. Mukamal et al., Circulation, vol. 105, 2002, pp. 2476–2481). Patients were interviewed about their weekly caffeinated tea consumption during the ...In Exercise 11.5 when you used the GSS to download a 3 × 3 table for marital happiness and family income in 2008, you should have obtained results similar to the table shown below. a. State the null and alternative ...Are people who believe in life after death happier? a. Go to the GSS Web site sda.berkeley.edu/GSS and download the contingency table for the 2008 survey relating happiness and whether you believe in life after death ...For murders in the United States in 2009, the table cross-tabulates the sex of the victim by the sex of the offender. Find and interpret a measure of association, treating sex of victim as the response variable.
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