An experiment includes a treatment condition, a no-treatment control, and a placebo control. Which two conditions should be compared to determine the size of the effect that is actually caused by the treatment?
a. placebo versus treatment
b. placebo versus no-treatment
c. treatment versus no-treatment
d. placebo control only
Question 2
What type of sample divides the population into nonoverlapping groups of N1, N2, N3, . . . Ni, such that N1 + N2 + N3 + . . . + Ni + N = N, and then performs a simple random sample of = n/N in each of the nonoverlapping groups?
a. simple random
b. stratified random
c. systematic random
d. cluster random
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