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mat2378-midterm2009practice

# mat2378-midterm2009practice - MAT 2378 Midterm practice 26...

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MAT 2378 Midterm practice 26 October, 2009 Professor: R. Kulik Time: 70 minutes Student Number: Family Name: First Name: This is a closed book examination. Only non-programmable and non-graphic calculators are permitted. Record your answer to each question in the table below. Number of pages: . NOTE: At the end of the examination, hand in only this page. You may keep the questionnaire. Question Answer 1 2 3 4 5 6 7 8 9 10 1

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1 Q 1. (2.23) As a part of a classic experiment on mutations, ten aliquots of identical size were taken from the same culture of the bacterium E.coli . For each aliquot, the number of bacteria resistant to a certain virus was determined. The results were as follows: 14 15 13 21 14 14 26 16 20 13 The mean, median and the third quartile are, respectively, : (a) 16.6; 14.5; 14 (b) 16.6; 14.5; 20 (c) 16.6; 14; 20 (d) 18.1; 14.5; 20 (e) none of the preceding Q 2. Suppose a certain drug test is 99% sensitive and 99% specific, that is, the test will correctly identify a drug user as testing positive 99% of the time, and will correctly identify a non-user as testing negative 99% of the time. Let’s assume a corporation decides to test its employees for opium use, and it is known 0.5% of the employees use the drug. The probability that, given a positive drug test, an employee is actually a drug user, is: HINT: compare Question 1 in Assignment 3.
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mat2378-midterm2009practice - MAT 2378 Midterm practice 26...

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