AMS 5 Study Guide - Quiz Guide: Simple Random Sample, Normal Distribution
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AMS 5 Full Course Notes
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Expected number = (proportion of 1 s in box) (number of draws)= 100 (c) (4 pts) what is the (approximate) probability that the number of 1 s in the sample is between. The se is 8, and the expected value is 320, so 330 320 = 10 = 1. 25 se. According to the normal approximation, the probability that the number of 1 s is between 320 and 330 is (approximately) equal to the area under the normal curve between 0 and 1. 25. This area is equal to half the area between 1. 25 and 1. 25 under the normal curve, which (according to the table) is 78. 87%. 95%-con dence interval for the percentage of all households in the metropolitan area who own two or more cars, or explain why this is not possible. 95-% con dence interval: (sample% 2se)= (60% 2. 44%). (b) (4 pts) of the sample households, 640 had annual incomes of , 000 or more.
