1.The following data were obtained in a four-group study:

Group1234

6635

5973

7961

5434

3543

a) Are the four group means significantly different from each other?

(b) Suppose all pairwise comparisons were investigated. If the is maintained at the level of 0.05, is the difference between the means of groups 2 and 4 significant?

(c) Use the SNK method to test all pairwise contrasts. Consider the per comparison error rate = 0.05. Does the result agree for the difference between the means of groups 2 and 4 with the results in (b).

If you could walk me through the answers so I understand the process better that would be really helpful:)