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# Ch07 - CHAPTER7 DISTRIBUTIONS Inthefollowing please...

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CHAPTER 7 RANDOM VARIABLES AND DISCRETE PROBABILTY  DISTRIBUTIONS   MULTIPLE CHOICE QUESTIONS In the following  multiple-choice questions, please circle the correct answer. 1. The  weighted  average  of the  possible  values  that  a  random  variable  X can  assume,   where  the  weights  are the  probabilities  of occurrence  of those  values,  is referred  to as   the: a. variance b. standard  deviation c. expected  value d. covariance ANSWER: c 2. The number  of accidents that occur annually on a busy stretch of highway  is an example   of: 3. A function  or rule that assigns a numerical value to each simple event  of an experiment   is called: 94

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95 Chapter Seven 4. If   X   and   Y   are  any  random  variables,  which  of the  following  identities  is not  always   true? 5. If  and   are random  variables, the sum  of all the conditional probabilities of  X  given a  specific value of  will always be: a. 0.0 b. 1.0 c. the average of the possible values of  X d. a value larger than  zero but smaller than  1.0 ANSWER: b 6. A  statistical  measure  of the  strength  of the  linear  relationship  between  two  random   variables  and   Y  is referred  to as the: 7. A table, formula, or graph  that shows  all possible values a random  variable can assume,   together with their associated  probabilities is called a: 8. If  and   Y  are random  variables with   E ( X ) = 5 and   E ( Y ) = 8, then  E (2 X +3 Y ) is:
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• Fall '10
• huang
• Probability distribution, Discrete probability distribution, c. µ, probability  distribution, random   variable

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