TABLE 10-18
As part of an evaluation program, a sporting goods retailer wanted to compare the downhill coasting speeds of four brands of bicycles. She took three of each brand and determined their maximum downhill speeds. The results are presented in miles per hour in the table below

-Referring to Table 10-18, the test is valid only if the population of speeds has the same variance for the four brands.

Question

TABLE 10-18
As part of an evaluation program, a sporting goods retailer wanted to compare the downhill coasting speeds of four brands of bicycles. She took three of each brand and determined their maximum downhill speeds. The results are presented in miles per hour in the table below
 
-Referring to Table 10-18, the test is valid only if the population of speeds has the same variance for the four brands.

Quizplus · Accepted Answer

The test is valid only if the population of speeds has the same variance for the four brands, which is called homogeneity of variances. If the variances are not equal, the results of the test may be unreliable.

TABLE 10-18 As Part of an Evaluation Program, a Sporting Goods Retailer