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ISDS Test 2 Study Guide

# ISDS Test 2 Study Guide - ISDS 2000 TEST 2 STUDY GUIDE...

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ISDS 2000 – TEST 2 STUDY GUIDE Chapter 5: 1. Know the definition of random variable and be able to determine whether a random variable is discrete or continuous. - Random Variable – a variable whose values correspond to the outcome of an experiment - Discrete – a random variable that can only take on a finite number of values (ex. if you toss a coin 6 times, you can get 2 heads or 3 heads but not 2 1/2 heads.) - Continuous – a random variable that can take on any value in a certain range (ex. As if measuring) 2. Understand the definition of probability distribution and probability function. - Probability distribution – describes how probabilities are distributed for each value of a random variable (basically a relative frequency table) - Probability function – f(x) see #4 for conditions 3. Be able to recognize the graph of a discrete probability distribution. 4. Know that: a. f(x) ≥ 0 for all values of x b. ∑f(x) = 1 - IN ENGLISH!!!! - Each of the discrete values has a certain probability of occurrence that is between zero and one. That is, a discrete function that allows negative values or values greater than one is not a probability function. The condition that the probabilities sum to one means that at least one of the values has to occur.

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