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Midterm 2 (Fall 2006)

# Midterm 2 (Fall 2006) - x 9 4 8 3 2 5 1 6[5 You want a 95...

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Statistics Test 2 Prof. VanderHoff Fall 2006 All work must be shown on exam to receive credit. 1. [6] Researchers have estimated that Iraqi fatalities since the U. S. invasion of Iraq are about 680,000. What did Steven Moore write about their methods? 2. [9] The probability that you find a parking place near campus on any day is 1/3. What is the probability you find parking on 3 of the next 4 days? 3. [10]. The class time has a mean=75 and a standard deviation=6. What is the probability that the sample average class time is between 73 and 79 from a sample of 15 classes? 4. [10] A sample of 300 students has 180 that would vote for Menendez. Construct a 99% confidence interval for the proportion of students who favor Menendez. 5. [15] Use the following data to construct a 95% confidence interval for the population mean:

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Unformatted text preview: x 9 4 8 3 2 5 1 6. [5] You want a 95% confidence interval with a maximum error=.02 for the proportion of students who will vote for Kean. How many students do you need in your sample? 7. [10] What are the following probabilities for the standard normal variable, Z: prob( Z=1) prob( -.33 < Z < 2.09) prob ( z< 1.48) 8 [10] What is the probability that Rutgers wins more than 8 games of the 11 games on their schedule? The probability Rutgers wins any game is .8. 9. [10] Calculate the 99% confidence interval for the population mean. A sample of 81 had a sample mean=22 and standard deviation=6. 10. [10] The RU-N basketball team will play 30 games. What is the probability they win 20 or more games if the probability they win any game equals .7? 11. [5] A class of 40 students has 22 men and 18 women. What is the probability that 3 of 5 chosen are men?...
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