Midterm 1 (Spring 2005)

Midterm 1 (Spring 2005) - Statistics Test 1 Prof....

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Statistics Test 1 Prof. VanderHoff Spring 2005 All work must be shown on exam to receive credit. 1. [5] The probability drawing a hearts from a deck of cards is ¼. The probability that rolling an even number with a die is ½. What is the probability of drawing a hearts and rolling an even number? 2. [5] The probability of snoozing is .2; the probability of sitting in stats class is .3. The probability of snoozing and sitting in stats is .1. Demonstrate whether snoozing and sitting in stats are independent. 3. [10] Not all visitors to a certain company's website are customers. In fact, the website administrator estimates that about 10% of all visitors to the website are looking for other websites. Assuming that this estimate is correct, find the probability that, in a random sample of 10 visitors to the website, exactly 8 actually are looking for the website. 4. [10] Let B and C be two events such that P(B)=.3 and P(C)=.4 . (a) Determine P(C or B) , given that B and C are mutually exclusive . (b) Determine P(Cor B) , given that B and C are independent .
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Midterm 1 (Spring 2005) - Statistics Test 1 Prof....

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