$$\text { TABLE 4-2 }$$ 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.
$$\begin{array}{l}
\begin{array} { lcc}
&\text { Did Well on Midterm}& \text {Did Poorlyon Midterm }\
\hline \text { Studyingfor Exam } & 80 & 20 \
\text { Went Bar Hopping } & 30 & 70
\end{array}
\end{array}$$

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

Question

$$\text { TABLE 4-2 }$$ 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.
 $$\begin{array}{l}
\begin{array} { lcc} 
&\text { Did Well on Midterm}& \text {Did Poorlyon Midterm }\
\hline \text { Studyingfor Exam } & 80 & 20 \
\text { Went Bar Hopping } & 30 & 70
\end{array}
\end{array}$$

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

Quizplus · Accepted Answer

The events "Did Well on Midterm" and "Studying for Exam" are statistically dependent because the probability of doing well on the midterm is affected by whether the student studied for the exam.

TABLE 4-2 \text { TABLE 4-2 } TABLE 4-2 An Alcohol Awareness Task Force at a Big-Ten University Sampled

$\text { TABLE 4-2 }$ An Alcohol Awareness Task Force at a Big-Ten University Sampled