An experiment is performed to compare the average reading scores of second grade children taught using four different methods. Students are randomly assigned to the four groups with 20 students per group. An analysis of variance is to be used to analyze the data. The following is a partially completed ANOVA table. Fill in the remaining details
|
Source
|
DF
|
SS
|
MS
|
F
|
|
Groups
|
136.21
|
3
|
45.403
|
5.105
|
|
Error/Within
|
675.83
|
76
|
8.893
|
|
|
Total
|
812.04
|
|
|
|
How much of the variability in reading scores is explained by teaching method?