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    Confidence interval for mean and Box Plot

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    The box Plot suggests that average time to drill under Wet Drilling is less than that of Dry drilling.
    b. Hypothesis testing
    H0: There is no significant difference in the mean time to drill under both methods.
    H1: There is significant difference in the mean time to drill under both methods.
    Test Statistic used is independent sample t test. The test statistic used is
    where
    Significance level = 0.01
    Rejection criteria: Reject the null hypothesis, if the calculated value of t is greater than the critical value of t at 0.01 significance level.

    Details
    t-Test: Two-Sample Assuming Equal Variances

    (Please see the ...

    Solution Summary

    This solution includes a step by step method for computing the given confidence interval and box plot.

    $2.19

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