prac.mt3 ans

prac.mt3 ans - Statistics 13A, Spring 2010, Practice...

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Statistics 13A, Spring 2010, Practice Midterm III 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 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 In the actual exam, the necessary tables will be attached. In this practice exam, please refer to the tables provided by the textbook. good luck! Midterm begins here. .. 1. Which of the following statements is true with re- gards to continuous random variables? (a) The height of the probability density curve shows the probability of an event (b) Probability of any event is strictly positive (c) Probabilities of events are determined from ar- eas under the curve (d) The probability distribution is always bell- shaped answer: c 2. Let X be a continuous random variable and c be a constant. Which of the following statements is false ? (a) The probability that X assumes a value in the interval ( x 1 , x 2 ) (where x 1 < x 2 ) is the area un- der the probability density function between x 1 and x 2 (b) P ( X = c ) = 0 (c) P ( X c ) = P ( X < c ) (d) P ( X > c ) = 1 - P ( X < c ) (e) None of the above answer: e 3. Suppose Z is the standard normal random variable, what is P ( Z > 1 . 35 ) ? (choose the closest answer) (a) 0.9115 (b) 0.0885 (c) 0.67 (d) -0.67 answer: b 4. The z -score representing the first quartile of the stan- dard normal distribution is approximately (choose
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prac.mt3 ans - Statistics 13A, Spring 2010, Practice...

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