Correlation

AP Statistics· difficulty 2/5

For a regression of y on x, sx = 4, sy = 8, and slope b = 1.0.

Summary statistics sx = 4 (units of x) sy = 8 (units of y) slope b = 1.0 r = ?

What is r?

  • A

    1.0

  • B

    0.5

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  • C

    0.25

  • D

    2.0

Explanation

r = b * sx/sy = 1.0 * (4/8) = 0.5.

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