TABLE 4-2
An alcohol awareness task force at a Big-Ten university sampled 200 students after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm. The following result was obtained.

-Referring to Table 4-2, the events "Did Well on Midterm" and "Studying for Exam" are
A) dependent.
B) mutually exclusive.
C) collective exhaustive.
D) None of the above.

Question

TABLE 4-2
An alcohol awareness task force at a Big-Ten university sampled 200 students after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm. The following result was obtained.
 
-Referring to Table 4-2, the events "Did Well on Midterm" and "Studying for Exam" are
A) dependent. 
B) mutually exclusive. 
C) collective exhaustive. 
D) None of the above.

Quizplus · Accepted Answer

The events "Did Well on Midterm" and "Studying for Exam" are dependent because the probability of doing well on the midterm is likely to increase if the student spent the weekend studying for the exam. Therefore, the occurrence of one event affects the probability of the occurrence of the other event.

TABLE 4-2 An Alcohol Awareness Task Force at a Big-Ten University Sampled