Chapter 14 Interval Estimation / Confidence Intervals
-we read the chart the same way as the standard normal with the only difference coming from the fact that we now have d.o.f which is (n-1) ii. Confidence Interval = ± tα/2 s = ± tα/2 s / recall that s2 = ∑ ( xi –)^2 / n-1 ; this is just sample variance. To get s we simply take the square root of s2 . ................
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