AMS 5 Study Guide - Quiz Guide: Simple Random Sample, Brie, Normal Distribution
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AMS 5 Full Course Notes
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Spring 2017: 100 hundred draws are made at random with replacement from a box of numbered tickets containing. Expected percentage = percentage of 1 s in box = 0. 9 0. 1 (proportion of 1 )(proportion of 0 ) Sample percentages approximately follow the normal curve when n is big enough (which it is in this case), so. 95%-con dence interval for the percentage of all households in the metropolitan area who own two or more computers. A 95%-con dence interval for the percentage of all households who own two or more computers is given by (sample %) 2se(%). 100% = 78. 4% and se(%) sample % = so 2se(%) 1. 646% and the con dence interval is (78. 4% 1. 646%). 100% 0. 823% (b) (2 pts) the 2500 households in the sample included 4900 children age 6 or younger. Of these 4900 children, 2940 watched at least three hours of tv per day.
