Homework 3

Due Monday Feb 19 at 11:59pm

Complete the (short) book problems and the question relating to odds ratios

Book Problems

Chapter 7.5

• 7
• 14
• 19
• 24 (Typo in d., should be \(R^2\) of 0.64)
• 30

Problem 1

Researchers recruited 451 patients with a high level of cardiovascular risk. They split these patients into two groups, a treated group that received stents (small mesh tube placed inside of vulnerable arteries) and medical management (medications, lifestyle coaching, etc.), and a control group that only received medical management. Of the 224 patients in the treatment group, 45 suffered a stroke within the first year of the study, while only 28 patients in the control group had a stroke during this time.

• Part A Using the given information, find the odds of having a stroke for each group
• Part B Find the odds ratio comparing the odds of stroke in the treatment (stent) group with the odds of a stroke in the control group. State your findings
• Part C Now give the odds of not having a stroke for each group. What is the odds ratio comparing the odds of not having a stroke in the control group with the odds of not having a stroke in the treatment group. How does this compare with what you found in Part B? Explain