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A teacher surveys his class to find out how long each student spent studying for a recent test. The time, in hours, each student spent studying is shown alongside their score in the following table.
Find and interpret Pearson's product-moment correlation coefficient, r, for this data.
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Find the equation of the regression line of s on t.
Use the regression line found in (b) to predict the score of a student who spent 7 hours studying.
Explain why the regression equation should not be used to predict the score of a student who studied 25 hours for the test.
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