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Confidence Intervals for the Slope of a Regression Model

AP Statistics· difficulty 3/5

A regression with n = 22 has slope 1.8 and SE = 0.4. t* for 90% CI with df = 20 is 1.725.

90% CI for Slope b = 1.8, SE = 0.4 df = 20, t* = 1.725

What is the 90% CI?

  • A

    (1.0, 2.6)

  • B

    (0.8, 2.8)

  • C

    (1.11, 2.49)

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  • D

    (1.4, 2.2)

Explanation

CI = 1.8 ± 1.725(0.4) = 1.8 ± 0.69 = (1.11, 2.49).

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