TABLE 11-4
An agronomist wants to compare the crop yield of 3 varieties of chickpea seeds.She plants 15 fields,5 with each variety.She then measures the crop yield in bushels per acre.Treating this as a completely randomized design,the results are presented in the table that follows.
-True or False: Referring to Table 11-4,the test is valid only if the population of crop yields has the same variance for the 3 varieties.

Question

TABLE 11-4
An agronomist wants to compare the crop yield of 3 varieties of chickpea seeds.She plants 15 fields,5 with each variety.She then measures the crop yield in bushels per acre.Treating this as a completely randomized design,the results are presented in the table that follows. 
-True or False: Referring to Table 11-4,the test is valid only if the population of crop yields has the same variance for the 3 varieties.

Quizplus · Accepted Answer

A completely randomized design assumes that the populations have equal variances. If the variances are unequal, the test may not be valid. Therefore, in this case, the test is valid only if the population of crop yields has the same variance for the 3 varieties.

TABLE 11-4 An Agronomist Wants to Compare the Crop Yield of 3