1) Tucker et al (1951) determined the effect of washing and removing excess moisture by wiping or by air current on the ascorbic acid content of turnip greens. The data in milligrams per 100 grams dry weight are shown in the accompanying table. Block Treatment 1 2 3 45 Control 850 975 Washed and blotted dry 857 1 189 918 968 909 Washed and dried in air current 917 1,072 9 75 930 954 Carry out an analysis of variance of these data. Use Dunnett's procedure to test differences between the control and treatment means. What error rate applies? As an alternative to Dunnett's procedure, the investigator might wish to compare 1) Control vs. the mean of the other two treatments 2) The two washing treatments Set up the necessary contrasts. Write out formally the implied null hypotheses. Are the contrasts orthogonal? Test the null hypothesis. What sort of error rate applies? 1) Tucker et al (1951) determined the effect of washing and removing excess moisture by wiping or by air current on the ascorbic acid content of turnip greens. The data in milligrams per 100 grams dry weight are shown in the accompanying table. Block Treatment 1 2 3 45 Control 850 975 Washed and blotted dry 857 1 189 918 968 909 Washed and dried in air current 917 1,072 9 75 930 954 Carry out an analysis of variance of these data. Use Dunnett's procedure to test differences between the control and treatment means. What error rate applies? As an alternative to Dunnett's procedure, the investigator might wish to compare 1) Control vs. the mean of the other two treatments 2) The two washing treatments Set up the necessary contrasts. Write out formally the implied null hypotheses. Are the contrasts orthogonal? Test the null hypothesis. What sort of error rate applies