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# Class Note for PUBHLTH 540 at UMass(2)

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This 1 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Massachusetts taught by a professor in Fall. Since its upload, it has received 22 views.

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Date Created: 02/06/15
Puleth 540 Introductory Biostatistics Page 1 of 1 Unit 6 Estimation Week 9 Practice Problems Due Monday November 24 2008 The results of IQ tests are known to be normally distributed Suppose that in 2007 the distribution of IQ test scores for persons aged 1835 years has a variance 62 225 A random sample of 9 persons take the IQ test The sample mean score is 115 1 Before you begin This exercise gives you practice calculating a con dence interval for the mean of a Normal distribution in the setting where the variance parameter is known See lecture notes pp 1 721 Calculate the 50 75 90 and 95 con dence interval estimates of the unknown population mean IQ score 2 Before you begin This exercise is asking you to think about and compare two aspects of the concept of a con dence interval 1 its width and 2 the level of con dence that we attach to the interval we are reporting Hint precision v con dence What tradeoffs are involved in reporting one interval estimate over another 3 Before you begin This exercise is reminder of some of the ideas of sampling distributions It is asking you to compute a probability for a sample mean It s actually drawing upon material presented in Unit 5 The Normal distribution Thus see lecture notes for Unit 5 speci cally page 22 If it is known that the population mean IQ score is u 105 what proportion of samples of size 6 will result in sample mean values in the interval 135150 docuwk9Jaracticedoc

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