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. Which statement correctly compares the data?
A.
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.
B.
The salesmen of company B generally sold more units than the salesmen of company A.
C.
The salesmen of company A generally sold the exact same number of units as the salesmen of company B.
D.
The salesmen of company A generally sold more units than the salesmen of company B.