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    Anova and confidence intervals

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    Using the confidence intervals: 95%
    Determine which groups differ in average shelf life.
    A B C D
    94 88 76 82
    100 89 69 80
    90 88 76 82
    97 83 79 78
    101 79 80 89
    90 82 72 80
    give test statistic, hypothesis, decision rule and hypothesis

    © BrainMass Inc. brainmass.com March 4, 2021, 5:45 pm ad1c9bdddf
    https://brainmass.com/statistics/analysis-of-variance/anova-confidence-intervals-9762

    Solution Preview

    Null Hypothesis:
    Ho: mu1 - mu2 = 0
    Alternative hypothesis:
    H1: mu1 - mu2 != 0

    Mean calculations:
    <A> = sum(A)/6 = 572/6 =95.33
    <b> = 509/6 = 84.83
    <C> = 452/6 = 75.33
    <D> = 491/6 = 81.83
    sum((A-<A>)^2) = 115.33
    sum((B-<b>)^2) = 82.83
    sum((C-<C>)^2) = 87.83
    sum((D-<D>)^2) = 72.57

    If t(calculated) > t(table) => Ho rejected

    for any combination: (like A and B)
    sqrt((1/n1) + ...

    Solution Summary

    The expert examines an ANOVA and confidence interval. The average shelf life of different groups are given. The solution answers the question(s) below.

    $2.49

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