Suppose we want to determine how long it takes on average for a typical adult to build four different styles of tables, which are referred to as A, B, C, and D. To create four treatment groups, the researcher begins by writing the name of each member of the population on a slip of paper. Next, the researcher puts all slips of paper into a hat and shuffles them well. Finally, the researcher draws slips of paper from the hat to determine the participants in the experiment. Identify the component missing from the researcher’s process.
Answer
A
The researcher did not assign individuals to treatment groups.
B
The researcher did not create the correct number of treatment groups.
C
The researcher did not select the experimental units randomly.
D
The researcher did not allow each experimental unit the chance of being chosen.
Explanation
The slips are shuffled and drawn from a hat, so the researcher is selecting participants randomly, and each person has a chance to be chosen. The process also specifies four styles, which can define four treatment groups. However, it does not say that the selected participants are assigned to those groups; that assignment is the missing component.
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