The Correlation Between a Family's Weekly Income and the Amount $r = 0.30$

question 106

Multiple Choice

The correlation between a family's weekly income and the amount they spend on restaurant meals
Is found to be $r = 0.30$
Which must be true?
I. Families tend to spend about 30% of their incomes in restaurants.
II. In general, the higher the income, the more the family spends in restaurants.
III. The line of best fit passes through 30% of the (income, restaurant$) data points.

• A) II only
• B) II and III only
• C) I only
• D) I, II, and III
• E) III only

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