A researcher wants to find out how much fins increase swimming speed.This hypothesis could be tested with a counterbalanced repeated measures design by
A) randomly assigning half the swimmers to the no-fin condition and half to the fin condition.
B) having all swimmers first swim without fins,then swim with fins.
C) having half the swimmers first swim without fins and then with fins,and having the other half swim first with fins and then without fins.
D) having some swimmers swim with fins,some swimmers swim with only one fin,and some swimmers swim with no fins.

Question

Quizplus · Accepted Answer

A counterbalanced repeated measures design requires that all participants receive both conditions of the independent variable (with and without fins), and the order of these conditions is counterbalanced across participants to control for order effects. Choice C best meets these requirements by randomly assigning half of the swimmers to start with fins and the other half to start without fins, thus counterbalancing the order.

A Researcher Wants to Find Out How Much Fins Increase