1. A researcher was interested in investigating the impact of Food and Drink in a Computer Classroom. The amount of food and drink consumed was correlated with alertness in class. The researcher also wanted to control for the variable of interest in subject matter when examining this relationship. Researcher A wanted to use bivariate correlations to examine this problem. S/he divided the sample into two groups that indicated different levels of interest (those taking the course as a requirement and those taking as an elective) and ran a bivariate correlation for each group. Researcher B used partial correlation to examine this issue. S/he used an interest scale (scaled 1 to 5) to measure interest in the subject matter and used this score as a control variable before examining the relationship food/drink consumed and alertness. Which researcher is addressing the problem most appropriately. In your response, provide at least two convincing reasons for your selection indicating why this approach is better than the other one. (8 pts)