SCENARIO 11-8 An important factor in selecting database software is the time required for a user to learn how to use the system.To evaluate three potential brands (A, B and C)of database software, a company designed a test involving five different employees.To reduce variability due to differences among employees, each of the five employees is trained on each of the three different brands. The amount of time (in hours)needed to learn each of the three different brands is given below: Below is the Excel output for the randomized block design:
-Referring to Scenario 11-8, the randomized block F test is valid only if the population of the amount of time needed has the same variance for the 3 brands.

Question

SCENARIO 11-8 An important factor in selecting database software is the time required for a user to learn how to use the system.To evaluate three potential brands (A, B and C)of database software, a company designed a test involving five different employees.To reduce variability due to differences among employees, each of the five employees is trained on each of the three different brands. The amount of time (in hours)needed to learn each of the three different brands is given below:  Below is the Excel output for the randomized block design: 
-Referring to Scenario 11-8, the randomized block F test is valid only if the population of the amount of time needed has the same variance for the 3 brands.

Quizplus · Accepted Answer

The randomized block F test assumes that the variances of the populations are equal for all brands being tested. If this assumption is not true, then the F test may not be valid. This is true because the randomized block F test assumes that the variances of the three brands are equal in the population, and if they are not, the results of the test may be invalid.

SCENARIO 11-8 an Important Factor in Selecting Database Software Is