A local mayoral candidate hired Xavier Xed to test whether the method of distributing campaign literature resulted in more people voting for a candidate.He distributed campaign literature about the mayoral candidate to the Stevenson neighbourhood in a bright blue envelope that a volunteer placed at each person's front door.He distributed the same campaign literature about the candidate to residents of the Fairwinds neighbourhood by mailing it in a plain white envelope.He later learned that Stevenson was a low-income area of the city that was almost entirely Filipino,foreign-born,and 95 percent Catholic.Fairwinds was an upper-income area in the city and its residents were 100 percent white,Canadian-born Protestants.What problem with internal validity might threaten the results of his experiment?
A)Selection bias
B)History effect
C)Experimental mortality
D)Maturation
E)Testing effect

Question

Quizplus · Accepted Answer

The problem with internal validity that might threaten the results of the experiment is selection bias. The two neighborhoods are quite different in terms of demographics, so the distribution method may have had different effects in each area based on the characteristics of the residents. This makes it difficult to determine whether any observed differences in voting behavior were due to the distribution method or other factors related to the neighborhoods.

A Local Mayoral Candidate Hired Xavier Xed to Test Whether