Research on discrimination in housing has found that a. discrimination in housing is less important than other forms of discrimination. b. when two people of different races apply as tenants for the same housing both are equally likely to be accepted or turned down. c. members of minority groups are frequently turned down for housing in situations in which a white person is not. d. reverse discrimination, or discrimination toward a white person is equally as common as discrimination against minority group members.

The answer is: C. Unlike fixed interval reinforcement schedules, with variable interval reinforcement schedules, the time between a behavior and the following consequences varies around a specified average.

When the researchers conduct a fixed interval reinforcement schedules , the reward for a certain behavior would be given after  a specific amount of time has passed.

When they conduct variable interval reinforcement schedules, the reward will be given within unpredictable time frame. Because the reward time is unpredictable, there is no expectation between the subject after the subject did the desired behavior. This will make the time between a behavior and the following consequences varies around a specified average depending on the subject's characteristic.