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The Correlation Between a Family's Weekly Income and the Amount

question 73

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.


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