AT&T; LTE 12:21 AM Test 2.docx QUESTION 19 You are investigating the role of phy

Question

AT&T; LTE 12:21 AM Test 2.docx QUESTION 19 You are investigating the role of physical activity in heart disease and suggest that physical activity protects against having a heart attack. While presenting these data to your colleagues, someone asks if you have thought about confounders such as factor X. This factor X could have confounded your interpretation of the data if it a. is a part of the pathway by which physical activity affects heart disease. b. is a factor associated with physical activity and heart disease. c. is a factor for some other disease, but not heart disease. d. as caused a lack of follow-up of test subjects. 2.5 points QUESTION 20 The strategy which is not aimed at reducing selection bias is: a. encouragement of high participation rates. b. tandardized protocol for structured interviews c. development of an explicit case definition. d. enollment of all cases in a defined time and region. 2.5 points QUESTION 21 Which of the following is not a method for controlling the effects of confounding in epidemiologic studies? b Blinding d. Matching Stratification 2.5 points

Explanation / Answer

Question 19 - Option C.

is a factor that some other disease, but not heart disease.

Question 20 - Option B.

Standardized protocol for structured interviews.

Question 21 - Option B.

Blinding is not a method for controlling.

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