Stat 225 Student Topics Exam 2

Stat 225 Student Topics Exam 2 - Stat 225 Topics for Exam 2...

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Stat 225 Topics for Exam 2 To study for Exam 2, practice the following skills will be helpful. This list is not exhaustive and is only meant as a guide to help you study. Random Variables ¾ Understand the difference between “Event” and “Random Variable” ¾ Know the difference between discrete and continuous random variables. ¾ Be able to write down the PMF table for a random variable described in a story problem (make sure that your probabilities add up to one!!) ¾ Graph PMFs in form of histograms. ¾ Compute probabilities and conditional probabilities using the “Fundamental Probability Formula” for a random variable with given PMF. Expected value, Variance ¾ Compute expected values of a random variable from the PMF table or from a Histogram ¾ Know the basis properties of expected value: ( ) ( ) E aX b aE X b + = + . ¾ Definition of variance and standard deviation and how to compute them. ¾ Basic properties of variance (both for dependent and independent random variables).
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