A Team of Researchers Examines the Time Spent in REM

question 195

Multiple Choice

A team of researchers examines the time spent in REM sleep and in each of the NREM stages among a large sample of adults ranging in age from 18 to 70 years old.The researchers compute three correlation coefficients: Correlation A,between participant age and total time spent in NREM stages 1 and 2; Correlation B,between participant age and total time spent in REM sleep; and,finally,Correlation C,between participant age and total time spent in NREM stages 3 and 4.Of these correlations,which should be the weakest? Which should be the strongest?

• A) Correlation B should be the weakest. Correlation A should be the strongest.
• B) Correlation B should be the weakest. Correlation C should be the strongest.
• C) Correlation C should be the weakest. Correlation A should be the strongest.
• D) Correlation A should be the weakest. Correlation C should be the strongest.

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Definitions:

Bonds

Financial instruments representing loans made by an investor to a borrower, typically corporate or governmental, which must be paid back with interest.

Positive Integers

Whole numbers greater than zero, found to the right of zero on the number line.

Difference

The result of subtracting one number from another to show the gap or distance between them.

Substitution

A method used in algebra and calculus involving replacing a variable with its corresponding value or another expression to simplify or solve an equation.