Question

Which of the following is an advantage of repeated measures over randomized groups designs?

a) Order effects are possible
b) The experimental groups are likely to be more random
c) Fewer participants are needed
d) Repeated measures design has no advantages over randomized group design

Answer 1

Repeated measures designs have the advantage of requiring fewer participants, as each participant acts as their own control and is subjected to all conditions of the experiment.

Step-by-step explanation:

Among the choices provided, the advantage of repeated measures over randomized groups designs is that fewer participants are needed (option c). Repeated measures designs involve the same participants being subjected to each condition of the experiment, thereby reducing the number of participants required. This is because each individual serves as their own control, which increases the efficiency and power of the design. Moreover, randomizing the order of treatments can help control for order effects and ensure that the treatment groups are comparable, as all subjects experience both treatments and random assignment eliminates the problem of lurking variables.