Professor McCormick decides to test her hypothesis that eating chocolate prior to exams increases students' test scores.She randomly assigns students to two groups at the beginning of the semester.One group receives a bar of chocolate before each test,while the other group receives another type of candy.She compares their scores at the end of the year,and finds that the students who ate the chocolate scored an average of ten points higher on their exams.What is a fair conclusion that can be drawn from this experiment?
A)Eating chocolate causes students' test scores to increase.
B)Eating chocolate is negatively correlated with students' test scores.
C)Eating chocolate likely increases students' level of happiness.
D)Eating chocolate increases general intelligence.

Question

Quizplus · Accepted Answer

The experiment suggests a causal relationship between eating chocolate and increased test scores. The random assignment of students to groups helps to control for other factors that may affect test scores, making it more likely that the difference in scores between the groups is due to the chocolate consumption. However, it is important to note that this experiment only provides evidence for a specific group of students and may not necessarily generalize to other populations.

Professor McCormick Decides to Test Her Hypothesis That Eating Chocolate