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Correlation between the scores of students

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Suppose that the correlation between the scores of students on Exam 1 and Exam 2 in a statistics class is r = 0.7. One way to use r is to compute the percent of the variation in Exam 2 scores can be explained by the straight-line relationship between Exam 2 scores and Exam 1 scores. This percent is about?

A) 84%. B) 70%. C) 49%. D) 30%. E) 7%.

Can you help me with this and explain why?

Also this one

Suppose that the least-squares regression line for predicting y from x is y = 100 + 1.3x. Which of the following is a possible value for the correlation between x and y? A) 1.3 B) -1.3 C) 0 D) -0.5 E) 0.5

Which one and why?

Reference no: EM132157509

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