Colin wants to find out how using fins increases swimming speed. If he uses an independent groups design, he would manipulate the variable by
A. requiring all swimmers to first swim with fins and then without fins.
B. 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.
C. having all swimmers first swim without fins and then with fins.
D. randomly requiring half the swimmers to swim without fins and the other half to swim with fins.
Answer: D
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