A telemarketing company is conducting a study of new calling scripts. A group of 75 employees will be randomly assigned to three new scripts. The study designer numbers the subjects from 01 to 75, and uses a table of random digits to select 50 unique, two-digit numbers in the range 01–75. The 25 subjects corresponding to the first 25 random two-digit numbers will be assigned to script 1, the second 25 to script 2, and the 25 remaining subjects to script 3. Select the statement that best describes the composition of the treatment groups.
Answer
A
The treatment groups should be comparable, because characteristics of the subjects should be roughly equivalent among the three groups.
B
The treatment groups should be comparable, because there are 25 subjects in each group.
C
The treatment groups should be comparable, because there are a relatively large number of subjects in each group.
D
The treatment groups will not be comparable.
Explanation
The random-digit process assigns subjects to groups by chance, so characteristics such as experience or calling ability should be roughly balanced across the three groups. This makes the groups comparable on average, though they may not be perfectly alike. Having 25 subjects in each group helps keep group sizes equal, but equal size alone does not ensure comparable characteristics.
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