Statistical Sciences 2244A/B Lecture 9: 2244-Lec 9
15 Nov 2016
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If the population is normal than the standard distribution should be. Question: do you think it"s very likely that the sample of 20 children (with mean. If we take a sample from the population do you think the mean would be 26. 3hours. Normal distribution of mean weights (in lbs), for srss of n=15. Since our sample is normal we expect our sample to give us a similar mean. When we take a single sample we expect the value of the mean to be close to the population mean, not one of the values that rarely occur. You have your srs, n=64, with x-bar =10 cm and sigma = 2 cm. Answer: about 95% of the samples possible will have means that are within approx. 4cm came from 2 population standard deviations (so b cant be right cause they are talking about population mean) (2 x sigma) /x is how we got the 0. 5cm.
