Q3 (13 points) Q3. A greenhouse study was conducted to compare the heights reached by a given species of plant grown in four different soil types. For each of the four soil types, three plants of the given species were seeded in three pots. At the end of one year, the plant heights were measured with the following results: Soil type Plant height, cm 15 9 14 25 21 19 AWN 17 23 20 10 13 16 a. Assuming fixed effects, write out the linear statistical model using the treatment effects formulation. b. Do the data provide sufficient evidence to indicate a difference in mean height among the four soil types? Test at the 5% level of significance. c. Provide an estimate of the common variance. d. Apply the Tukey procedure at a familywise error rate of orw = 0.10 to compare all possible pairs of means. Time left Hide 3 days, 9 hours 2:11 10/14/2