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An article published in USA Today stated that "in a study of 200 colorectal surgery patients, 104 were kept warm with blankets and intravenous...
An article published in USA Today stated that "in a study of 200 colorectal surgery patients, 104 were kept warm with blankets and intravenous fluids; 96 were kept cool. The results show: Only 6 of those warmed developed wound infections vs. 18 who were kept cool." Using a 0.05 significance level, you need to test the claim of the article's headline: "Warmer surgical patients recover better." This means that fewer of the warmer patients (group 1) developed infections as compares to cooler patients (group 2). To do so, answer each of the following questions.
1. What type of test can you use to determine whether or not the assumption of equal population variances is satisfied? Use this test to test the claim that the two population variances (for the obsessive-compulsive group and the healthy control group) are different.
2. Construct a 95% confidence interval estimate of the difference between the mean brain volume of obsessive-compulsive patients and the mean brain volume of healthy persons. Based on the result, does it appear that the total brain volume can be used as an indicator of obsessive compulsive disorders? Be sure to interpret your confidence interval.
