A research psychologist is planning an experiment to determine whether the use of imagery-picturing a word in your mind-affects people's ability to memorize. He wants to use two groups of subjects: a group that memorizes a set of 20 words using the imagery technique, and a control group that does not use imagery.
a. Use a randomization technique to divide a group of 20 subjects into two groups of equal size.
b. How can the researcher randomly select the group of 20 subjects?
c. Suppose the researcher offers to pay subjects $50 each to participate in the experiment and uses the first 20 students who apply. Would this group behave as if it were a simple random sample of size n = 20?