Julie Finds That the Number of Hours She Sleeps Each

question 201

Multiple Choice

Julie finds that the number of hours she sleeps each night is related to the scores she receives on quizzes the next day. As her sleep approaches 8 hours, her quiz scores improve; as her sleep drops to 5 hours, her quiz scores show a similar decline. Julie realizes that __________

• A) there is a negative correlation between the number of hours she sleeps and her quiz grades.
• B) there is a positive correlation between the number of hours she sleeps and her quiz grades.
• C) her low quiz scores are caused by sleep deprivation the night before a quiz.
• D) she should sleep about 10 hours a night to ensure 100 percent quiz grades.

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Definitions:

Labor

The effort by humans to produce goods or services in exchange for wages or salary.

Machines

Mechanical or electrical devices that perform or assist in performing tasks or calculations.

Average Cost

The total cost of production divided by the number of units produced, indicating the cost per unit of output.

Copper

A red-brown metal, highly conductive of electricity and heat, used extensively in electrical wiring and in making alloys such as bronze and brass.