Afarmer is testing the effects of four different fertilizers on the yields of a certain variety of tomato plants. the four fertilizers are applied to each of five different tomato plants, and the numbers of tomatoes produced by each plant are recorded. fertilizer a fertilizer b fertilizer c fertilizer d 33 26 31 29 29 22 36 34 37 16 42 30 39 17 34 31 35 20 30 34 a. conduct an anova to test the null hypothesis that the means of each fertilizer are all equal. b. if the means of the three fertilizers are not all equal, conduct a t-test to test each pair of means (note: you will need to know if the variances of the samples are equal)