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# Class Note for PUBHLTH 540 at UMass(5)

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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 15 views.

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Date Created: 02/06/15
Puleth 540 Introductory Biostatistics Page 1 of 1 Unit 4 Bernoulli and Binomial Distributions Week 6 Practice Problems Revised Due Date Monday November 3 2008 A A l Betore you begin This exercise gives you practice in calculating number of ways to choose See notes pp 1113 an dor text pp 9094 Need more Here are a few resources on the web too htt wwwshodoror interactivatediscussionslablesAndCombinatori httpmathforumorgdr ma qfagfagcombpennhtml Suppose that my 2008 BE540 class that meets in class in Worcester MA has 10 students a I wish to pair up students to work on homework together How many pairs of 2 students could I form b Next Iwish to form project groups of size 5 How many groups of 5 students could I form 2 Betore you begin This exercise is a straightforward application of a binomial probability calculation See notes pp 1418 an dor text pp 9495 Just in case here are two nice resources for the binomial httpstattrekcomLessonZBinomialaspxTutorialStat httDwikistatuclaedusocrindeXDhDAP Statistics Curriculum 2007 Distrib Binomial A die will be rolled six times What are the chances that over all six rolls the die lands neither ace nor deuce exactly 2 times 3 This is also an application of a binomial probability calculation Suppose that in the general population there is a 2 chance that a child will be born with a genetic anomaly What is the probability that no congenital anomaly will be found among four random births 4 This is a slightly harder application of a bin omial probability calculation Suppose it is known that for a given couple there is a 25 chance that a child of theirs will have a particular recessive disease If they have three children what are the chances that at least one of them will be affected 5 This exercise is the most involved Just try it Suppose a quiz contains 20 truefalse questions You know the correct answer to the first 10 questions You have no idea of the correct answer to questions 11 through 20 and decide to answer each using the coin toss method Calculate the probability of obtaining a total quiz score of at least 85 docuWk67practicedoc

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