A statistician in a small town wishes to determine if persons treated for an accident involving a joint injury were more likely to go to an orthopedist or a chiropractor. In the small town, there is only one orthopedist and one chiropractor. The orthopedist saw 118 people for joint injuries in one year. The chiropractor saw 83.
-The degrees of freedom for this chi-square problem are
A)1.
B)2.
C)5.
D)200.

Question

A statistician in a small town wishes to determine if persons treated for an accident involving a joint injury were more likely to go to an orthopedist or a chiropractor. In the small town, there is only one orthopedist and one chiropractor. The orthopedist saw 118 people for joint injuries in one year. The chiropractor saw 83. 
-The degrees of freedom for this chi-square problem are
A)1.
B)2.
C)5.
D)200.

Quizplus · Accepted Answer

The degrees of freedom for a chi-square test is equal to the number of categories minus 1. In this case, there are 2 categories, so the degrees of freedom is 2 - 1 = 1.

A Statistician in a Small Town Wishes to Determine If