Question

a cardiologist is interested in the mean recovery period of her patients who have had heart attacks. define the following in terms of the study. give examples where appropriate. part (a) part (b) part (c) part (d) part (e) the variable the variable is the number of patients who have had a heart attack. the variable is the time it takes to recover from a heart attack. the variable is the number of patients who visit the doctor. the variable is the age of a patient when he or she had a heart attack.

Explanation:

The study is about the mean recovery period of patients who had heart attacks. A variable in this context should relate to the recovery period. The first option is about the number of patients (not recovery period), the third is about doctor visits (irrelevant), the fourth is about patient age at heart attack (not recovery period). The second option, "The variable is the time it takes to recover from a heart attack," directly relates to the recovery period the cardiologist is interested in.

Answer:

B. The variable is the time it takes to recover from a heart attack.