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19 January, 06:15

The speeds of vehicles traveling on a highway are normally distributed with an unknown population mean and standard deviation. If a random sample of 38 vehicles is taken to estimate the mean vehicle speed, what t-score should be used to find a 99% confidence interval estimate for the population mean

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  1. 19 January, 06:57
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    The t-score of 2.715 should be used

    Step-by-step explanation:

    Degrees of freedom = => n - 1 = => 38 - 1 = => 37

    to find 99% confidence interval, Hence,

    Find t0.005 in front of 37 degrees of freedom,

    Therefore the answer is, t-score = 2.715
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