SCENARIO 11-12 The Marketing Manager of a Company Producing a New Cereal

Multiple Choice

SCENARIO 11-12
The marketing manager of a company producing a new cereal aimed for children wants to examine the effect of the color and shape of the box's logo on the approval rating of the cereal. He combined 4 colors and 3 shapes to produce a total of 12 designs. Each logo was presented to 2 different groups (a total of 24 groups) and the approval rating for each was recorded and is shown below. The manager analyzed these data using the α = 0.05 level of significance for all inferences.


-Referring to Scenario 11-11,what degrees of freedom should be used to determine the critical value of the F ratio against which to test for differences in the mean charges for doctors among the four primary specialty areas?

A) numerator df = 1,denominator df = 159
B) numerator df = 3,denominator df = 159
C) numerator df = 1,denominator df = 152
D) numerator df = 3,denominator df = 152