Lewis, Lonnie Homework 3-1

Lewis, Lonnie Homework 3-1 - BST322 HOMEWORK#3 Name_Lewis...

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BST322: HOMEWORK #3 Name: _Lewis, Lonnie ____________ Directions: (a) Enter all your answers into this Word document and submit the entire document. (b) When you use Statcrunch to calculate an answer, copy and paste the results into this document. (c) For questions with answer spaces identified, please enter your answers in those spaces. (d) While putting your answers in a different color font is helpful, please DO NOT use red font since this is the color used to provide feedback on your answers. Grade = 82% = 16.4/20 points 1. Suppose we obtained data on vein size after application of a nitroglycerin ointment in a sample of 60 patients. The mean vein size for the sample is found to be 7.8mm with a standard deviation of 2.1. Using t values (because information on the true SEM is not available): a. What are the confidence limits for a 95% confidence interval? [5 points] b. What are the confidence limits for a 99% confidence interval? [5 points] ANS. a. For a 95% L-7.2575126 / U-8.342487 b. For 99% L-7.078374 / U-8.521626 2. In a pilot study evaluating the use of a new drug to lower resting heart rates (HR) of patients, the following data were recorded: Subject # Resting HR 001 72 002 88 003 71 004 87 005 64 006 77 007 79 008 59 009 66 010 68 011 78 012 89 013 91 014 81 015 77 016 75 017 69
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a. Given that the average resting HR of the general population for this study is 72, use StatCrunch to perform the appropriate t test. What is the value of t ? [9 points] b. Using an alpha of 0.05, is the t statistic significant? Why? [5 points] c.
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