Experimental Psychology – PSY 270 010 20046
Review for Test on Chapter 11 and 12
Suppose you conduct a factorial experiment with a 3 by 4 design and both factors are between subjects. Assume you need 10 subjects per condition. How many subjects do you need?
Suppose, in a 3 by 4 factorial design, the first factor is within subjects and the second is between. If you need 10 subjects per condition, how many subjects do you need?
Suppose in a 3 by 4 factorial design, the first factor is between subjects and the second is within. If you need 10 subjects per condition, how many subject do you need?
Suppose in a 3 by 4 factorial design, both factors are within subjects. If you need 10 subjects per condition, how many subjects do you need?
Suppose some researchers in San Francisco are investigating the effects of reading different kinds of promotional material on people’s attitudes towards the value of education. They hypothesize that reading promotional material for Mensa (the organization for people with a genius IQ) might cause people to consider education more valuable than reading such material for joining a trade union.
After they have randomly assigned each of a group of subjects to their two conditions, they notice that one group is entirely white subjects, whereas the other is all Asians. They believe that the effects they are trying to support could be different depending upon the race of the subject. Although such differences might be interesting in themselves, the researchers’ main concern is that they don’t want such differences to interfere with their ability to support their hypothesis.
Discuss what the researchers could do in this situation, and the relative advantages and disadvantages of the different approaches.