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PSTAT 5A Practice TEST 2 Winter 2009 Your Name: Your TA’s Name: Your Section Time: INSTRUCTIONS: FOLLOW CAREFULLY You have 50 minutes to complete this exam. You should attempt ALL questions. Anyone found copying another students’ work, or cheating in any other way, will be given an ‘F’ for the course. You are NOT allowed to consult your notes or textbook during this test. You may use a calculator. You may NOT use a cell phone as a calculator. Read each question carefully . Answer all questions. You must show your work clearly: NO WORK = NO CREDIT 1

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PSTAT 5A Practice TEST 2 Winter 2009 PSTAT 5A TEST 2 FORMULA SHEET Expected Value of a Discrete Random Variable: ( 29 ( 29 = x all x xp X E Variance of a Discrete Random Variable: ( 29 ( 29 2 2 μ - = x all x p x X Var Binomial Distribution X is BIN ( n, p ) mean = np ; Variance = np (1- p ) Normal Distribution is ( , ) X N μ σ x z μ σ - = Sample Mean = x n Sample Standard Deviation = 2 ( ) ( 1) x x n - - IQR = Q3 - Q1 Range = Maximum – Minimum Sampling distribution of P ˆ Mean= p Standard Deviation = (
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