A Study of Child Development Measures the Age (In Months)

question 7

Multiple Choice

A study of child development measures the age (in months) at which a child begins to talk and also the child's score on an ability test given several years later. The study asks whether the age at which a child talks helps predict the later test score. The least- squares regression line of test score y on age x is y = 110 - 1.3x. According to this regression line, what happens (on the average) when a child starts talking one month later?

• A) The test score goes down 110 points.
• B) The test score goes down 1.3 points.
• C) The test score goes up 110 points.
• D) The test score goes up 1.3 points.
• E) The test score is 108.7.

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