Which of the following threats to internal validity is an example of the problem of experimental mortality?
a. During the implementation of a study on violence in a prison, the prison administrator is replaced
b. During a study, subjects become tired and their response time is affected
c. During a study in which students interview prison inmates, a number of student interviewers graduate and must be replaced
d. During a study comparing two groups of prison inmates, some of the members of one group are released on parole
Question 2
You are interested in determining whether allowing prison inmates to have televisions in their cells will reduce violent behavior. You measure the rate of violence in the prison, install televisions in all cells, and then measure the rate of violence again one month later to see if there has been any change. What research design have you used?
a. A controlled experiment
b. A one-group pretest-posttest design
c. A quasi-experiment
d. A life history
A coronary artery bypass graft (CABG) is a procedure to bypass a blocked coronary artery. The proced
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