Here is the result table of an experiment which determines t

Here is the result table of an experiment which determines the effect of air voids on percentage retained strength of asphalt. For purposes of the experiment, air voids are controlled at three levels; low (2-4%), medium (4-6%), and high (6-8%). The data are shown in the following table Choose the best response to following ANOVA table. What is the total degrees of freedom 23 26 31 35

Solution

What is the total degrees of freedom?

As

df(tot) = N - 1

and

N = total sample size = 24, then

df(tot) = 24 - 1 = 23 [ANSWER, C]