HW 4 soln

# HW 4 soln - #2 also being green is now 70 Let A = light#1...

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Stat 133 HW 4 (10 pts) soln Please read and follow the information in the “Homework Policies” document posted in the Homework section of Carmen. It’s your responsibility to know how to avoid academic misconduct. TF/MC. Circle the correct answer. 1. Every random event has a 50% chance of occurring. a. YES b. NO 2. If you randomly sample 3 students and ask whether they own an iPad (yes, no), then the sample space has how many outcomes in it? a. 2 b. 3 c. 6 d. 8 3. You have 2 traffic lights on your way to school. Suppose light #1 is green 60% of the time and light #2 is green 40% of the time. Let A = light #1 is green and B = light #2 is green. Are A and B independent? a. Yes b. No c. Not enough information to tell 4. Suppose light #2 is green 40% of the time. Suppose that IF light #1 is green, the chance of light #2 being green is also 40%. Let A = light #1 is green and B = light #2 is green. Are A and B independent? a. Yes b. No c. Not enough information to tell 5. Suppose light #2 is green 40% of the time. Suppose that IF light #1 is green, the chance of light

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Unformatted text preview: #2 also being green is now 70%. Let A = light #1 is green and B = light #2 is green. Are A and B independent? a. Yes b. No c. Not enough information to tell 6. If two events are disjoint, they cannot occur at the same time. a. True b. False 7. If A and B are independent, then you can show that P(A and B) = P(A)+P(B)-P(A)*P(B) a. True b. False 8. Suppose 95% of students have some sort of portable electronic device. You sample two students at random. What is the chance that exactly one of them owns an electronic device? a. .95 b. .95 x .95 c. .95 x .05 d. .95 x .05 x 2 For problems 9 and 10: Suppose 75% of all supermarkets sell books. You randomly select 10 supermarkets. 9. What is the chance that at least one of them sells books? a. 1-.75 10 b. .75 10 c. .25 10 d. None of the above 10. The events “A = at least one supermarket sells books” and “B = at most one supermarket sells books” are complements of each other. a. Yes b. No...
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## This note was uploaded on 01/05/2012 for the course STAT 133 taught by Professor Rumseyjohnson during the Fall '07 term at Ohio State.

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HW 4 soln - #2 also being green is now 70 Let A = light#1...

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