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 "Did Poorly on Midterm" are
A)dependent.
B)mutually exclusive.
C)collectively exhaustive.
D)All 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 "Did Poorly on Midterm" are
A)dependent. 
B)mutually exclusive. 
C)collectively exhaustive. 
D)All of the above.

Quizplus · Accepted Answer

The events "Did Well on Midterm" and "Did Poorly on Midterm" are mutually exclusive because they cannot both occur at the same time. They are also collectively exhaustive because they cover all possible outcomes of the midterm exam.

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