STAT2593 Lecture Notes - Lecture 7: Confidence Interval
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20 : conclusion: we are 95% confidence that the true (population) average porosity is between 4. 52 and 5. 18. 2 w: w = width, what sample size is necessary to estimate the average to within 0. 2 with 99% confidence. 100 1 : x z n , x z n . 2 2: 100 1 % confidence interval for population mean is, difference from other formula: 99% confidence interval for and interpret the resulting interval: solution: x=0. 81 sec , s=0. 34 sec , n =110, 99% confidence interval for mean %mu is, x z0. 005 n , x z 0. 005 n s s. 110: quick review on how to calculate z . Section 7. 3: interval based on the normal population: if for small sample. N 1 d. f. x: d. f = degrees of freedom n, d. f = n 1, 100 1 % confidence interval for is: x . For population mean %mu is: x t n , x t n s s.
