Question

Three dentists wanted to compare the ages of their patients. They each calculated their patients’ mean age and the mean absolute deviation of their ages. They displayed the results in a table.
Which statements are true?
Choose exactly two answers that are correct.
DentistMean patient ageMAD
Appiah439.7
Cantwell2913.9
Singh4114.1
A. Dr. Appiah’s patients’ ages vary more than do Dr. Cantwell’s patients’ ages.
B. Dr. Appiah’s patients’ ages vary less than do Dr. Singh’s patients’ ages.
C. Dr. Cantwell’s patients’ ages and Dr. Singh’s patients’ ages vary about the same amount.

Answer 1

B. Dr. Appiah’s patients’ ages vary less than do Dr. Singh’s patients’ ages.

C. Dr. Cantwell’s patients’ ages and Dr. Singh’s patients’ ages vary about the same amount.