To compare the cost of three shipping methods,a random sample of four shipments is taken for each of three firms.The cost per shipment is shown below. In a one-factor ANOVA,degrees of freedom for the within-groups sum of squares will be:
A) 11.
B) 3.
C) 9.

Question

To compare the cost of three shipping methods,a random sample of four shipments is taken for each of three firms.The cost per shipment is shown below.  In a one-factor ANOVA,degrees of freedom for the within-groups sum of squares will be:
A) 11. 
B) 3. 
C) 9.

Quizplus · Accepted Answer

The within-groups sum of squares degrees of freedom is calculated as (total sample size) minus (number of groups). In this case, the total sample size is 12 (4 shipments per firm, for 3 firms), and the number of groups is 3, so the degrees of freedom for the within-groups sum of squares is 9. Therefore, the correct answer is C.

To Compare the Cost of Three Shipping Methods,a Random Sample