Carrying Out a Test for a Population Mean

AP Statistics· difficulty 1/5

Five subjects' before/after weights (lb): (180,178), (200,196), (165,167), (210,205), (175,170).

Subject Before After 1 180 178 2 200 196 3 165 167 4 210 205 5 175 170

Using d = before - after, what is the mean difference?

  • A

    1.5

  • B

    5.0

  • C

    -2.8

  • D

    2.8

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Explanation

Differences: 2, 4, -2, 5, 5. Mean = (2+4-2+5+5)/5 = 14/5 = 2.8.

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