What percentage of children in the United States has a formal pre-kindergarten experience, such as preschool?

At Skinner Elementary School, teachers pass out "skinner bucks" to students who turn in papers on time, obey the teacher, and finish their homework. The paper "bucks" can be traded in at the end of the week for special treats or game-playing time on the classroom computer. This system most resembles a

a. participant modeling technique. b. contingency contract. c. group extinction procedure. d. token economy. e. Thorndike technique.

The more tasks that individuals attempt to accomplish at the same time, the more efficiency they are able to gain

Indicate whether the statement is true or false.