Battery life has a strong, negative, linear relationship with temperature. If the least-squares regression line using...
Battery life has a strong, negative, linear relationship with temperature. If the least-squares regression line using xx = temperature explains 90% of the variation in battery life, which of the following must be the correlation, rr, between battery life and temperature?
Using the least-squares regression line, y^=−25.5+1.5xy^=−25.5+1.5x, what is the residual for the data point at (28,19)?
Homework Answers
R2 = 0.90
Correlation r = √0.90 = 0.9487
Yhat = -25. 5+1.5X = -25. 5 + 1.5 * 28 = 16.5
Residual = 19 - 16.5= 2.5
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14
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23
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40
51
55
67
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