Midterm 2 (Spring 2006)

Midterm 2 (Spring 2006) - What is the probability they win...

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Statistics Test 2 Prof. VanderHoff Spring 2006 All work must be shown on exam to receive credit. 1. [8] A class has 20 students; 8 are econ majors. What is the probability of choosing 3 econ majors when 5 students are chosen? [without replacement] 2. [10] 150 voters are polled; 88 approve of Bush. Calculate the 99% confidence interval for the proportion of voters who approve of Bush. . 3. [8] A multiple choice test has 20 question and each question has 5 choices. Assuming a student guesses at each question, what’s the probability of getting 7 or more correct? 4. [7] You need an estimate with a maximum error of 10 with a 90% confidence level. The population standard deviation = 15. What size sample do you need? 5. [15] Calculate a 90% confidence interval for the population mean of TEMP using the following sample: TEMP 2 -1 0 4 6 7 2 4
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6. [10] The probability that the Nets win is 2/3.
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Unformatted text preview: What is the probability they win 3 of the next 5 games? 7. [8] The probability that Rutgers wins a game is .7. What is the probability they win 30 or more of 45 games? 8. [8] The average GPA of a student who voted for Forrester is 3.5; the standard deviation is .7. What is the probability that the sample average GPA will exceed 3.8 from a sample of 40 students who vote for Forrester? 9. [8 The population mean time is 120 minutes and the population standard deviation is 13 minutes. What is the probability of a time greater than 125 minutes? 10. [10] A sample of 90 has a sample mean=75 and a sample standard deviation=8. Calculate a 95% confidence interval for the population mean. 11. [8] What is the expected value of X? X probability 17 0.1 33 0.3 41 0.3 45 0.2 55 0.1...
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This note was uploaded on 11/06/2010 for the course STATS 220:231 taught by Professor Vanderhoff during the Spring '10 term at Rutgers.

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Midterm 2 (Spring 2006) - What is the probability they win...

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