Uploaded February 2024 | Updated September 2026, 7 hours ago

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In this video we answer the following question: Test scores are highly correlated with number of hours studied. The average test score is 82 with a standard deviation of 3 points. The average number of hours studied is 2 with a standard deviation of .5 hours. The correlation coefficient is r=0.9.
a) Find the equation of the regression line that predicts a test score based on the number of hours.
b) A student studies for 3 hours and scores 90 points. What is the residual?

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