Instruction 4.2
An alcohol awareness task force at a large Australian university sampled 200 students after the final exam to ask them whether they went out to a pub on the weekend before the exam or spent the weekend studying, and whether they did well or poorly on the exam. The following result was obtained.
$$\begin{array} { | l | l | l | }
\hline & \text { Did Well on Exam } & \text { Did Poorly on Exam } \
\hline \text { Studying for Exam } & 80 & 20 \
\hline \text { Went to a pub } & 30 & 70 \
\hline
\end{array}$$
-Referring to Instruction 4.2,the events 'Did Well on Exam' and 'Did Poorly on Exam' are
A) statistically dependent.
B) collective exhaustive.
C) mutually exclusive.
D) All of the above.

Question

Instruction 4.2
An alcohol awareness task force at a large Australian university sampled 200 students after the final exam to ask them whether they went out to a pub on the weekend before the exam or spent the weekend studying, and whether they did well or poorly on the exam. The following result was obtained.
 $$\begin{array} { | l | l | l | } 
\hline & \text { Did Well on Exam } & \text { Did Poorly on Exam } \
\hline \text { Studying for Exam } & 80 & 20 \
\hline \text { Went to a pub } & 30 & 70 \
\hline
\end{array}$$
-Referring to Instruction 4.2,the events 'Did Well on Exam' and 'Did Poorly on Exam' are
A) statistically dependent.
B) collective exhaustive.
C) mutually exclusive.
D) All of the above.

Quizplus · Accepted Answer

The events 'Did Well on Exam' and 'Did Poorly on Exam' are mutually exclusive because they cannot occur at the same time. They are also collective exhaustive because they cover all possible outcomes of the exam.

Instruction 4 -Referring to Instruction 4