Countries with a majoritarian, or first past the post, electoral system, tend to have two major parties

In using an interrupted time series for single-case experiments, you must assume

a. that the pattern of pretreatment behavior would have continued if the treatment had not occurred. b. that the treatment is effective and look for the evidence in the patterns until you find it. c. that the participant will be highly motivated. d. that the principles of learning are not correct.

If one third of all elements in a population will be selected for a simple random sample, the probability of selection for each element in the population is ______.

A. 0.05 B. 0.13 C. 0.33 D. 0.67