mt2.a key

mt2.a key - Statistics 13A Spring 2010 Midterm II Version A...

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Unformatted text preview: Statistics 13A, Spring 2010, Midterm II Version A Name: ID: Instructions: • 50 minutes, closed book midterm • one letter-sized (double-sided) “cheat-sheet”, hand held calculator and scrap paper are allowed • 20 multiple choice problems, 5 points each • put your name & ID on this midterm and scantron • hand in both this midterm and scantron (the midterm will be used as a proof of your presence in the un- likely event of missing scantron) • grading is based on scantron which will not be re- turned to you • this is Version A, please mark the corresponding circle on the scantran • good luck! Midterm begins here... 1. An experiment consists of throwing 4 fair dice si- multaneously. The number of simple events in this experiment is (a) 4 (b) 36 (c) 256 (d) 1296 (e) 4096 answer: d ( 6 4 = 1296 ) 2. Refer to Problem 1, what is the probability that the sum of the four dice is 5? (choose the closest answer) (a) 0.001 (b) 0.002 (c) 0.003 (d) 0.004 (e) 0.005 answer: c (event A = sum of the four dice equals 5 , then A = { 1112 , 1121 , 1211 , 2111 } . Thus P ( A ) = 4 / 1296 ≈ . 003 ) 3. An urn contains 9 balls, 5 red and 4 yellow. Five balls are randomly selected from the urn with replace- ment , and the number X of the red balls is recorded. How many possible values X can assume? (a) 5 (b) 6 (c) 7 (d) 8 (e) 9 answer: b (X ∈ { , 1 , 2 , 3 , 4 , 5 } ) 4. Refer to Problem 3, what is the probability of getting no red ball? (choose the closest answer)red ball?...
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This note was uploaded on 02/27/2012 for the course STA 13 taught by Professor Samaniego during the Spring '10 term at UC Davis.

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mt2.a key - Statistics 13A Spring 2010 Midterm II Version A...

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