Consider the following data on five groups.

1. what time is used for this information
2. Test if there is a significant difference in the mean of the groups with 5% level of significance. (SAS only)
3. Assume that we want to see the contrasts. Do the contrast tests to compare the mean for the first three groups with the last two and for the first two with the third by hands.

Group 1	8.706	10.362	11.552	6.941	10.983	10.092	6.421	14.943
Group 2	15.931	22.968	18.590	16.567	15.944
Group 3	21.637	14.492	17.965	18.851	22.891	22.028	16.884	17.252
Group 4	18.325	25.435	19.141	21.238	22.196	18.038	22.628
Group 5	31.163	26.053	24.419	32.145	28.966	30.207	29.142	33.212	25.694