Which of the Following Techniques Is an Appropriate Way of Obtaining

Multiple Choice

Which of the following techniques is an appropriate way of obtaining random assignment to conditions? (circle all that apply)

A) flip a coin to determine whether each participant is placed in condition 1 or 2
B) pre-arrange (at random) all possible experimental conditions (e.g., 4) into groups, choose an arbitrary starting point, and the next four participants will be exposed to the arbitrarily ordered 4 conditions (e.g., 1, 4, 3, 2)
C) pre-arrange the order of two conditions by alternating them one after the other, then choose an arbitrary starting point when the first participant arrives (e.g., 2, 1, 2, 1…)
D) for 4 conditions, randomly determine a starting time, then use a random numbers table to determine which conditions will be administered during each hour of the day (e.g., 8:01-9:00 = condition 1; 9:01-10:00 = condition 3)