Chapter 3 - AP Statistics MC Practice Test

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e. A correlation of near zero indicates no (or little) linear relationship, either positive or negative. Answers a, b and d indicate some form of linear relationship. Answer c may or may not be true depending on whether the

correlation is zero due to random scatter or due to a strong curved relationship. It is possible to have a zero correlation where there is a strong relationship, just not a linear one.

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c. This is another way of saying the typical error between the actual values and the predicted values using

the linear model.

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b. The correlation does not have units attached to it.

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b. The slope gives the predicted increase in y for each 1 unit increase in x. So, if x increases 5 units, then the predicted value of y increases 5 times the slope or 5(3.3) = 16.5 degrees Fahrenheit.

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e. Ethiopia has more people per doctor than expected, based on how many people it has per TV.

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d. When k = 31, the sum of the squared residuals is minimized.