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The data in the accompanying table show the weight of randomly selected packages shipped by delivery companies A, B, and C. 
a. Perform a one-way ANOVA using a=0.05 to determine if there is a difference in the average package weights shipped by these three delivery companies.
 b. If warranted, perform a multiple comparison test to determine which pairs are different using a = 0.05.

A(1) B (2) C (3)
5.5 1.6 2.7
19.9 8.1 24.3
16.5 9.0 17.8
12.1 2.9 15.9
22.3 2.1 8.0
6.1 18.5 5.6
6.7 0.1 4.4
6.9 21.7 1.3