t1 - Stat 5101 First Midterm Exam October 9, 2002 Name...

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Stat 5101 First Midterm Exam October 9, 2002 Name Student ID The exam is closed book and closed notes. You may use one 8 1 2 × 11 sheet of paper with formulas, etc. You may use a calculator, but shouldn’t need to. Put all of your work on this test form (use the back if necessary). Show your work or give an explanation of your answer. No credit for numbers with no indication of where they came from. 1. [15 pts.] A box contains 20 light bulbs of which 3 are defective. Suppose 5 light bulbs are selected at random without replacement from the box. What is the probability that none of the selected light bulbs is defective. You may express the answer as a formula that evaluates to a number. The actual numerical answer is not required. 2. [20 pts.] Suppose a drug test is used to screen employees of a company for drug use. Suppose that if the test is applied to an actual drug user the probability that the person will (correctly) test positive is 0.96 and the probability that the person will (falsely) test negative is 0.04.
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This note was uploaded on 10/28/2010 for the course STAT 5101 taught by Professor Staff during the Fall '02 term at Minnesota.

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t1 - Stat 5101 First Midterm Exam October 9, 2002 Name...

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