EXAMPLE 12.11

Degrees of freedom for the Facebook friends study. In the Facebook friends study, we have I = 5 and N = 134. Therefore,

DFT = N − 1 = 134 − 1 = 133

DFG = I − 1 = 5 − 1 = 4

DFE = N − I = 134 − 5 = 129

These are the entries in the df column of Figure 12.8.