There are three hospitals in our area and the following data shows the
number of outpatient surgeries performed at each hospital.  If we use
the .05 significance level, is there a difference in the mean number
of surgeries performed by hospitals and which hospitals are different?

Thanks for your help.
 X	Y	Z
14	18	24
20	24	15
16	22	14
18	20	22
20	28	24
17	25	20
14	26	19
15	24	21
17	25	20
16	26	20

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Clarification of Question by wagner-ga on 04 Sep 2005 17:22 PDT

How are these statistics used to find the mean?