Midterm 2 (Fall 2005)

# Midterm 2 (Fall 2005) - SIZE 5 3 8 4 7 3 5 7[7 The...

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Statistics Test 2 Prof. VanderHoff Fall 2005 All work must be shown on exam to receive credit. 1. [10] A sample of 64 students has a mean commute time of 28 minutes and a standard deviation equal to 4. What is the 90% confident interval for the population mean commute time? 2. [10] A sample of 50 students has 29 who will vote for the Republican. Calculate the 99% confidence interval for the proportion of students who vote Republican. 3. [5] The mean golf score is 93 and the standard deviation is 7. What is the probability of a score less than 80? 4. [10] What size sample is required to have a maximum error of .05 with 90% confidence for the proportion of students who will vote? 5. [7] The probability that the Nets win is .6. What is the probability they win between 8 and 12 games of the next 15 games? 6. [15] Calculate a 95% confidence interval for the population mean of SIZE using the following sample:

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Unformatted text preview: SIZE 5 3 8 4 7 3 5 7. [7] The probability that Rutgers wins a game is .75. What is the probability they win 3 of 4 games? 8. [8] The probability that a student votes for Forrester is .6. What is the probability that 50 or more students of 90 students vote for Forrester? 9. [7] The population mean time is 120 minutes and the population standard deviation is 13 minutes. What is the probability that a sample of 36 has a sample mean greater than 125 minutes? 10. [7] what is the probability that you arrive between 5 and 10 minutes after noon. Arrival time has a uniform distribution a minimum value of 0 minutes after noon and a maximum value of 25 minutes after noon. 11. [7] What is the expected TIME? time PROB 10 0.2 20 0.3 30 0.5 12. [7] If the distance of trips is normally distributed with mean=10 miles and standard deviation=2 miles, what distance is exceeded by 60% of the trips?...
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Midterm 2 (Fall 2005) - SIZE 5 3 8 4 7 3 5 7[7 The...

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