Question: Battery life has a strong, negative, linear relationship with temperature. If the least-squares regression line usingx= temperature explains 90% of the variation in battery life,

Battery life has a strong, negative, linear relationship with temperature. If the least-squares regression line usingx= temperature explains 90% of the variation in battery life, which of the following must be the correlation,r between battery life and temperature?

7. Battery life has a strong, negative, linear relationship with temperature. If the least- squares regression line using * = temperature explains 90% of the variation in battery life, which of the following must be the correlation, r, between battery life and temperature? (A) -0.90 (B) 0.90 (C) -0.95 (D) 0.95 (E) Cannot be determined without the original data

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