Instruction 2.9
A sample of 200 students at a large university was taken after the final exam to ask them whether they went out on the weekend before the exam or spent the weekend studying, and whether they did well or poorly on the exam. The following table contains the result.
$$\begin{array} { | l | l | l | }
\hline & \text { Did Well on Exam } & \text { Did Poorly on Exam } \
\hline \text { Studying for Exam } & 80 & 20 \
\hline \text { Went out on the weekend } & 30 & 70 \
\hline
\end{array}$$
-Referring to Instruction 2.9,if the sample is a good representation of the population,we can expect _________ %of the students in the population to spend the weekend studying and do poorly on the exam.
A) 50
B) 20
C) 45
D) 10

Question

Instruction 2.9
A sample of 200 students at a large university was taken after the final exam to ask them whether they went out on the weekend before the exam or spent the weekend studying, and whether they did well or poorly on the exam. The following table contains the result.
 $$\begin{array} { | l | l | l | } 
\hline & \text { Did Well on Exam } & \text { Did Poorly on Exam } \
\hline \text { Studying for Exam } & 80 & 20 \
\hline \text { Went out on the weekend } & 30 & 70 \
\hline
\end{array}$$
-Referring to Instruction 2.9,if the sample is a good representation of the population,we can expect _________ %of the students in the population to spend the weekend studying and do poorly on the exam.
A) 50
B) 20
C) 45
D) 10

Quizplus · Accepted Answer

10% of the students in the sample spent the weekend studying and did poorly on the exam (20 out of 200 students), suggesting the same percentage could be expected in the population if the sample is representative.

Instruction 2 -Referring to Instruction 2