Read the following excerpts from the New York Times (December 17, 1996) article Chance of Heart Attack Increases for Those Who Suffer from D
Read the following excerpts from the New York Times (December 17, 1996) article Chance of Heart Attack Increases for Those Who Suffer from Depression. A report in the December 16, 1996 issue of Circulation reports on a study that finds that those who are subjects to depression are four times more likely to have a heart attack than those who are not depressed.
The study involved 1551 people in the Baltimore area who took part in a study in 1980. In this study, interviewers asked questions like:
“In your lifetime, have you ever had two weeks or more in which you lost al interest and pleasure in things you usually cared about and enjoyed?”
They were also asked questions about unusual changes in their appetite and in their sleep. Based on this information, subjects were classified according to their depression status and their heart attack status was recorded.
Of the 444 who were classified as depressed, 27 had a history of heart attack.
1. Is this an observational study or is it an experiment? ·
A. experiment or B. observational
2. What is the response variable for this study?
A. heart attack status. or B. depression status
3. What is the explanatory variable for this study?
A. depression status or B. heart attack status
4. The value of 6 is a:
A. statistic or B. parameter