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2.23.10 HW 4

2.23.10 HW 4 - Biostatistics Bios600.001 Second Semester...

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Biostatistics Bios600.001 Second Semester, 2009-2010 Home Work 4: Estimating and Comparing Population Means; Confidence Intervals via the t-distribution; Tests of Hypotheses and Bootstrapping Instructions: This problem set consists of one problem. Again, we ask you to make a homework directory on your computer to save your SAS output files for each problem so that you might refer back to them in the future and could show your work (e.g. for an unexpected audit!). You’ll be asked to submit your work in hard copy in the form of responses to the following steps and questions. Due Date: 9:30 am in class on Feb 23, 2010. Problem 1. Costs of Carotid Endarterectomy in Maryland Learning Objectives: Students who successfully complete this project section will be able to: Use sampling distribution theory for the mean and for differences between two means to create confidence intervals and hypothesis tests; Use bootstrapping to determine confidence intervals; Use confidence intervals and tests of hypotheses to draw inferences about the differences in average Carotid Endarterectomy (CE) costs between men and women. Scientific Background: An interesting question is how mean CE costs differ between men and women. This section builds upon the exploratory analysis by estimating mean costs for different strata and by using confidence intervals and tests of hypotheses to address the question of how the CE cost distribution differs between men and women. Here we have list of

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