The following data were obtained from a sample of 12 respondents. Approximately what percent of the variation in respondents' highest grade of schooling completed does fathers' highest grade of schooling explain?

Highest Grade of School Highest Grade of School Highest Grade of
Completed (Respondent) Completed (Father) Completed (Mother)
12 12 12
14 10 12
14 14 12
10 8 8
14 12 12
16 12 12
15 10 5
12 6 6
16 16 20
14 13 13
15 14 12
14 14 14

Mean 13.83 11.75 11.50
St. Dev. 1.75 2.90 3.90
Variance 3.06 8.02 15.18