STAT332 Study Guide - Final Guide: Simple Random Sample, Jarlabanke Runestones, Systematic Sampling
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It has smaller variance and is unbiased as well. (d) 3 = 1/2 + 1/4 = 3/4. 3. (a) it would be nice to use simple random sampling without replacement (srs) but it is likely too expensive unless the items are already numbered and it is easy to locate an item with a speci ed label. Usually systematic sampling is used in this context. (b) p( ) = p(all 20 items are perfect) P (accept the shipment with defective rate and n sample size) = (1 )n. Now we set = 1%, then we have from which, we can get (1 0. 01)n 0. 05 n 298. 07. The recommended sample size would be n = 299. Population size: n=10, 000 10, 000 100 100 = 10000 (10km=10,000m) Sample statistics: y = 0. 72, s = 1. 011. 95% con dence interval for the average: 0. 72 1. 96q1 50.
