Suppose they say there is no difference, on average, in the number of minutes teachers (GROUP A) and admin (GROUP B) spend answering emails on a typical day.

You believe that teachers, on average, spend more time answering emails.

Assume both groups have equal variances.

SAMPLE

GROUP A

GROUP B

XA	f
14	5
17	2
20	5
24	3

XB	f
11	2
16	4
18	6
22	2

If you picked one score from Group B and used it to estimate the population mean of Group B, on average, how far off would you be?