Instruction 2-6
a Sample of 200 Students at a Large

question 51

Multiple Choice

Instruction 2-6
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 2-6,if the sample is a good representation of the population,we can expect ________ percent of those who spent the weekend studying to do poorly on the exam.

• A)20
• B)10
• C)50
• D)45

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Definitions:

Mammals

Warm-blooded vertebrates characterized by the presence of mammary glands, which females use to feed their young, and usually hair or fur on their bodies.

Aquatic Animals

Animals that live in water for most or all of their lives, including fish, amphibians, and various invertebrates, adapted to their liquid environment in various ways.

Wood Lice

Terrestrial crustaceans from the order Isopoda, known for their ability to roll into a ball as a defense mechanism; commonly found in moist environments.

Osmoconformers

Organisms that maintain internal osmotic pressure that is in balance with that of their surrounding environment.