Use the following situation to answer the next seven questions.
A researcher is interested in studying the effect of geographic location of grocery stores on the prices they charge for various food items. A typical "market basket" is selected and the researcher obtains data on the total basket price from 15 randomly selected stores as shown below. Note that 5 of the stores were inner city stores, 5 suburban stores and 5 campus stores.

-The degrees of freedom associated with the within-group sum-of-squares in the above problem is
A) 2.
B) 3.
C) 12.
D) 14.
E) 15.

Question

Use the following situation to answer the next seven questions.
A researcher is interested in studying the effect of geographic location of grocery stores on the prices they charge for various food items. A typical "market basket" is selected and the researcher obtains data on the total basket price from 15 randomly selected stores as shown below. Note that 5 of the stores were inner city stores, 5 suburban stores and 5 campus stores.
 
-The degrees of freedom associated with the within-group sum-of-squares in the above problem is
A) 2. 
B) 3. 
C) 12. 
D) 14. 
E) 15.

Quizplus · Accepted Answer

The degrees of freedom associated with the within-group sum-of-squares is calculated as the total number of observations minus the number of groups. If there are 15 observations across 3 groups, the degrees of freedom would be 15 - 3 = 12.

Use the Following Situation to Answer the Next Seven Questions