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

Explanation:

To determine the correct option for "The statistic" in this study, we recall the definitions: a statistic is a numerical measure that describes a sample (a group) from a population. The population here is all the cardiologist’s patients who had a heart attack, and a statistic would describe a sample (a group) of these patients. The study is about the mean recovery period, not age.

• Option 1: Describes the population mean (parameter), not a statistic.
• Option 2: Describes the average recovery period for a group (sample) of the patients, which fits the definition of a statistic.
• Option 3: Focuses on age, not recovery period (the variable of interest).
• Option 4: Focuses on age of a group, not recovery period.

Answer:

B. The statistic is the average recovery period for a group of the cardiologist's patients who have had a heart attack.