A researcher was interested in determining the effects of different types of drugs on problem solving. The researcher randomly assigned 50 participants to take a depressant, 50 participants to take a stimulant, and 50 participants to take a placebo (i.e., sugar pill). All of the participants were given an hour to complete a set of simple arithmetic problems. Higher scores (scored as a percentage of correct answers) on the test indicated that more answers were correct. The researcher's question was: Is there a difference between these groups in how many questions were answere correctl ? In this case, what test do you use? questions were answered correctly?