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)
the sample
the sample is all of the cardiologists patients who have had a heart attack.
the sample is a group of the cardiologists patients with heart disease.
the sample is all of the cardiologists patients
the sample is a group of the cardiologists patients who have had a heart attack.

Explanation:

In a study about the mean recovery period of patients who had heart attacks, the sample should be a subset of the population (all such patients of the cardiologist). The population is all the cardiologist’s patients who had a heart attack, so the sample is a group (subset) of those patients. The first option is the population (all such patients), the second mentions heart disease (not specific to heart attacks), the third is all patients (not just heart attack patients). So the correct option is the one about a group of the cardiologist’s patients who had a heart attack.

Answer:

D. The sample is a group of the cardiologist's patients who have had a heart attack. (Assuming the options are labeled as A, B, C, D with the last option being D. If the original labels were different, adjust the identifier accordingly, e.g., if the last option was labeled as the fourth option with label like "Option 4", then "Option 4. The sample is a group of the cardiologist's patients who have had a heart attack.")