Psychology review: 11. An executive in a stockbrokerage firm works with his office door closed. At the same time every hour he opens the door to see what his employees are doing. The employees have learned to work only during the five minutes before he opens the door. Their work pattern is typical of responses that are reinforced on a schedule.
A. fixed-ratio
B. fixed-interval
C. variable-ratio
D. variable-interval

Which article of the us constitution addresses the issue of interpeting the laws of the united states

Prior to 1994, rwanda's ethnic population was composed of a. a tutsi minority and a hutu majority b. a hutu minority and a tutsi majority c. an even number of hutus and tutsis d. a rwandan majority with hutu and tutsi minorities select the best answer from the choices provided. a b c d

In the spring of 1989, thousands of protesters gathered in tiananmen square in beijing, china. they rallied around a plaster statue that resembled the statue of liberty which they called “the goddess of democracy.” these protestors were seeking a) united states assistance in gaining better health care. b) economic reforms which would allow more chinese exports. c) the boycott of the future olympic games scheduled for beijing. d) political reforms to allow more freedom of speech and political representation.