A Local Mayoral Candidate Hired Xavier Xed to Test Whether

Multiple Choice

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