A manager at a publishing company randomly selects seven employees each from among the writers and the editors at the company. He records their typing speeds, in words per minute, and lists the data as shown.

The manager wants to use the data to estimate the mean typing speeds of the company's writers and editors.

Can the sample means be used to estimate the typing speeds for all writers and editors of the company, and why?
A.
Yes, the sample means can be used to estimate the typing speeds of all writers and editors of the company because they are different from each other.
B.
Yes, the sample means can be used to estimate the typing speeds of all writers and editors of the company because they are relatively close to each other.
C.
No, the sample means cannot be used to estimate the typing speeds of all writers and editors of the company because they are different from each other.
D.
No, the sample means cannot be used to estimate the typing speeds of all writers and editors of the company because they are relatively close to each other.