1.The experiment proceeded as normal, with the experimental group hearing about the potential presence of a gun as the confederates left the study and the control group not hearing about the gun. Unfortunately, hearing about the possible presence of a gun frightened some of the experimental participants, who did not show up for the second interview with the interviewer on day two. All of the control participants returned for the second interview. The researchers found that those in the experimental group did not differ from those in the control group about the likelihood of a gun. That is, the mean score that a gun was present during the second interview was similar for the experimental group (M = 67%, SD = 12.4%) and the control group (M = 63%, SD = 11.16%).

a.Maturation

b.Regression to the mean

c.Selection

d.Mortality

e.Instrumentation

f.Testing

g.History

h.Interactions

i.Diffusion

j.No Threat

2.The experiment proceeded as normal, with the experimental group hearing about the potential presence of a gun as the confederates left the study and the control group not hearing about the gun. Unfortunately, word spread around campus about a man with a gun who stole a laptop during a study. Unknown to the study researchers, many potential participants participated in the research anyway, and kept an eye out for a gun, knowing that they might be asked about it. The researchers found that those in the experimental group did not differ from those in the control group about the likelihood of a gun. That is, the mean score that a gun was present during the second interview was similar for the experimental group (M = 67%, SD = 12.4%) and the control group (M = 63%, SD = 11.16%).

a.Maturation

b.Regression to the mean

c.Selection

d.Mortality

e.Instrumentation

f.Testing

g.History

h.Interactions

i.Diffusion

j.No Threat