Confidence intervals, t tests, P values
We can’t just say that the estimated σˆ is sometimes 20% smaller than the true value, and sometimes 20% larger, so it all cancels out. It doesn’t, because σ doesn’t have a symmetrical distribution, but something derived from a chi-square distribution (which wehave not introduced yet). Confidence intervals, ttests, P values – p.16/31 ................
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