John surveyed 15 salesmen from two different companies on the number of units each of them sold in one day. Each dot represents a salesman.

Question

Which statement correctly compares the data?
A.
The salesmen of company A generally sold the exact same number of units as the salesmen of company B.
B.
The salesmen of company B generally sold more units than the salesmen of company A.
C.
The salesmen of company A generally sold more units than the salesmen of company B.
D.
Although the mean of the number of units sold by the salesmen of company B is greater than the mean of the number of units sold by the salesmen of company A, the variability creates too much overlap for any conclusion to be made.

Answer 1

D. Although the mean of the number of units sold by the salesmen of company B is greater than the mean of the number of units sold by the salesmen of company A, the variability creates too much overlap for any conclusion to be made.