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AP Statistics· difficulty 2/5

A regression has r-squared = 0.81 and a positive slope.

Regression Output slope b = +2.3 (positive) R-Sq = 0.81 (81%) r = ?

What is r?

  • A

    +0.90

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  • B

    -0.90

  • C

    0.66

  • D

    0.81

Explanation

r = +sqrt(0.81) = 0.90 (positive because the slope is positive).

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