Confidence Intervals and Hypothesis Testing for Variance
the mean. We need an interval for which we have 95% confidence that the interval contains the population variance 2 V X. (5) Let 2 F Ub = 2 F 29,.025 for which 2.5% of F2 values are above, and 2 Lb = 2 F 29,.975 for which 97.5% are above (2.5% below), for 29 degrees of freedom. We can use a F2 table or a TI83/84 to calculate that (6) = 45.7222 ... ................
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