TABLE 11-6
An agronomist wants to compare the crop yield of 3 varieties of chickpea seeds. She plants all 3 varieties of the seeds on each of 5 different patches of fields. She then measures the crop yield in bushels per acre. Treating this as a randomized block design, the results are presented in the table that follows.
-Referring to Table 11-6, based on the Tukey-Kramer procedure with an overall level of significance of 0.01, the agronomist would decide that there is a significant difference between the crop yield of Smith and Trevor seeds.

Question

TABLE 11-6
An agronomist wants to compare the crop yield of 3 varieties of chickpea seeds. She plants all 3 varieties of the seeds on each of 5 different patches of fields. She then measures the crop yield in bushels per acre. Treating this as a randomized block design, the results are presented in the table that follows. 
-Referring to Table 11-6, based on the Tukey-Kramer procedure with an overall level of significance of 0.01, the agronomist would decide that there is a significant difference between the crop yield of Smith and Trevor seeds.

Quizplus · Accepted Answer

The agronomist would use the Tukey-Kramer procedure to compare the mean crop yield of each variety of seed. From the table, we see that the difference in mean yield between Smith and Trevor is the largest (12.4 - 7.6 = 4.8 bushels/acre) and exceeds the Tukey-Kramer critical value of 4.51 for 15 degrees of freedom and an overall significance level of 0.01. Therefore, the agronomist would conclude that there is a significant difference between the crop yield of Smith and Trevor seeds.

TABLE 11-6 An Agronomist Wants to Compare the Crop Yield of 3