Mandy has a habit of buying lottery tickets every day. She won her first lottery when she was a freshman in college. Three months after her first win, she won another lottery. She won her third lottery two years later when she was a junior. She wants to stop buying tickets but cannot resist doing so as her winnings act as reinforcement for her buying behavior. In the context of operant conditioning, which of the following reinforcement schedules do the lottery winnings illustrate?
A. a variable-interval schedule
B. a fixed-ratio schedule
C. a variable-ratio schedule
D. a fixed-interval schedule

Which of the following is the least effective way to reach a potential sales prospect? referral cold call direct mail personal visit

The management of a private investment club has a fund of $250,000 earmarked for investment in stocks. to arrive at an acceptable overall level of risk, the stocks that management is considering have been classified into three categories: high risk (x), medium risk (y), and low risk (z). management estimates that high risk stocks will have a rate of return of 15%/year; medium risk stocks, 10%/year; and low risk stocks, 6%/year. the amount of money invested in low risk stocks is to be twice the sum of the amount invested in stocks of the other two categories. if the investment goal is to have a rate of return of 9% on the total investment, determine how much the club should invest in each type of stock. (assume that all the money available for investment is invested.)

The simple interest in a loan of $200 at 10 percent interest per year is