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If n=15. (x-bar)=50, and s=9, construct a confidence interval at a 80% confidence level. Assume the data came from a normally

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If the data is normally distributed, then for a small sample size (<30) , confidence intervals for mean \mu is obtained by using student's t-distribution with (n-1) d.f.

If the data is normally distributed then for small sample size, confidence interval for mean is geven by (ł - t. 2 h + d ) -

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