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Math Help - Confidence Interval

  1. #1
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    Aug 2009
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    Confidence Interval

    Hey guys, I've attached the question(b) and my attempt at the answer. Have I done it correctly? Thanks xx
    Attached Thumbnails Attached Thumbnails Confidence Interval-4b.jpg   Confidence Interval-4b-answer.jpg  
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  2. #2
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    Joined
    Aug 2009
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    9

    CI for variances ratio

    There is a Fisher's criterion whose statistic seems like what you put down here. It's used to reject 0-hypothesis of equal variances. The statistic is (s_1)^2/(s_2)^2, where (s_1)^2 and (s_2)^2 are group variances estimates. It has F-distribution provided sigma_1=sigma_2 equation is true. So your CI left and right bound estimates look credible.
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