Question

the parameter
the parameter is the average recovery period for a group of the cardiologists patients who have had a heart attack.
the parameter is the average age of a group of the cardiologists patients who have had a heart attack.
the parameter is the average age of the cardiologists patients who have had a heart attack.
the parameter is the average recovery period for all of the cardiologists patients who have had a heart attack.

Explanation:

A parameter in statistics refers to a characteristic of a population. Here, the population is all of the cardiologist's patients who have had a heart attack. We need to identify which option describes the parameter (characteristic of the entire population). The first three options refer to a group (sample) or incorrect focus, while the last option refers to the average recovery period for all (the population) of the cardiologist's patients who had a heart attack.

Answer:

D. The parameter is the average recovery period for all of the cardiologist's patients who have had a heart attack.