Tarpley and Schroeder Attempted to Reduce Face-Slapping in an 8-Year-Old

Multiple Choice

Tarpley and Schroeder attempted to reduce face-slapping in an 8-year-old boy by providing food when the boy played with a ball. The result was that face-slapping __________.

A) decreased by 40% in two hours
B) decreased by 60% in one hour
C) decreased by 90% in 40 minutes
D) increased by 50% in 20 minutes