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    Hypothesis testing - Confidence Intervals

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    Problem. Test scores for class are: 93%, 77%, 90%, 85%, 86%, 81%, 88%

    At a = .10 can it be said that the standard deviation is greater than 4%. State (1) the null hypothesis (2) determine the critical value (3) determine the test statistic (4) State decision and summary

    Also, construct the 90% confidence interval for the population standard deviation

    Please show work and formulas.

    © BrainMass Inc. brainmass.com June 3, 2020, 8:07 pm ad1c9bdddf
    https://brainmass.com/statistics/hypothesis-testing/hypothesis-testing-confidence-intervals-124212

    Solution Summary

    The solution calculates the confidence intervals for test scores for class.

    $2.19

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