Exhibit 12-1
When individuals in a sample of 150 were asked whether or not they supported capital punishment, the following information was obtained. We are interested in determining whether or not the opinions of the individuals (as to Yes, No, and No Opinion) are uniformly distributed.
-Refer to Exhibit 12-1. The number of degrees of freedom associated with this problem is
A)150
B)149
C)2

Question

Exhibit 12-1
When individuals in a sample of 150 were asked whether or not they supported capital punishment, the following information was obtained.  We are interested in determining whether or not the opinions of the individuals (as to Yes, No, and No Opinion) are uniformly distributed.
-Refer to Exhibit 12-1. The number of degrees of freedom associated with this problem is
A)150 
B)149 
C)2

Quizplus · Accepted Answer

The number of degrees of freedom in a goodness-of-fit test is calculated by subtracting 1 from the number of categories being tested. In this case, there are three categories (Yes, No, and No Opinion), so the degrees of freedom is 3-1=2. Therefore, the best choice is C.

Exhibit 12-1 When Individuals in a Sample of 150 Were Asked Whether