Questions Below Will Be Bases on the Following Study: a Researcher

Multiple Choice

Questions below will be bases on the following study: A researcher wishes to test whether the drug, magnesium pemoline, has any influence on intelligence. Two groups of subjects are randomly selected from the population of Omega University students. Group A is given the magnesium pemoline and then tested on the Stanford-Binet IQ test. Group B is given a placebo and, then, also tested on the Stanford-Binet. Both groups are tested under identical environmental conditions.
-If the IQ scores in Group A had been significantly higher than those in Group B, we may conclude that

A) the magnesium pemoline probably caused an increase in IQ scores
B) the magnesium pemoline probably caused a decrease in IQ scores
C) cause and effect statements cannot be inferred from this study
D) none of these