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13 December, 09:13

The health of the bear population in yellowstone national park is monitored by periodic measurements. a sample of 54 bears has a mean weight of 182.9 lb. assuming the standard deviation is known to be 121.8lb find a 99% confidence intreval estimate

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  1. 13 December, 10:04
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    The 99% confidence interval will be found as follows:

    x_bar + / - z (σ/√n)

    where

    z - z-score

    σ-sigma

    n=sample size

    thus from the information given we shall have:

    182.9+/-2.58 (121.8/√54)

    =182.9+/-42.7632

    =225.6632 or 140.1368
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