Hey guys, I've attached the question(b) and my attempt at the answer. Have I done it correctly? Thanks xx

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- Aug 10th 2009, 12:39 PMJontanConfidence Interval
Hey guys, I've attached the question(b) and my attempt at the answer. Have I done it correctly? Thanks xx

- Aug 12th 2009, 05:28 AMkobylkinksCI 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.