MAT 3377 Lecture Notes - Lecture 7: Stratified Sampling, Bias Of An Estimator, Confidence Interval
20 Dec 2018
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757 i minimal sample size of 757 is needed to achieve the precision with tolerance level e 0. 03 and risk 9 0 i a no. O l no 2212 17 n l 6570 tl. 273 is needed based on the preliminary results a 273. C ft 2 fff p i 90 confidence interval for populationproportion is o 1143 o 1856. It all is possible for retail because it is difficult the 120 accounts to either to easily the sample was randomly accounts making it srswor. 240 g i the estimated io is 440. And the variance of estimator estimated the unbiased is 240. 8. Using stratified sample mean the estimated yu is 371. 2 and the estimated variance for this estimator is 39. 4. O 5 30 t o 35 22 t o 15 17 vartystri ntaf. int e 0. 5 fpc fe atcnf t o3571 7 10. 152. Se vfartystrt me 1. 21 i is an unbiased estimator for tv with the value of 25. 3.
