What is the value for X2left (chi-squared - left) for a 95% confidence interval when n=18? Anyone? Like a foreign language to me..
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I don't know what 'chi-squared - left' means. A $\displaystyle \chi^2$ is a random variable. I'll guess that you want a CI for $\displaystyle \sigma^2$, which is a constant. CI's guess at constant. Prediction Interval's guess at random variables.
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