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Correlation

AP Statistics· difficulty 2/5

For a regression of y on x, sx = 4, sy = 6, and slope b = 0.9.

Summary statistics sx = 4 (units of x) sy = 6 (units of y) slope b = 0.9 r = ?

What is r?

  • A

    1.35

  • B

    0.6

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  • C

    0.4

  • D

    0.9

Explanation

r = b * sx/sy = 0.9 * (4/6) = 0.6.

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