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Solution to STAT 350 Exam 2 Review Questions (Spring …

Solution to STAT 350 Exam 2 Review Questions ( spring 2015)04/11//2015 1. A random sample of 26 offshore oil workers took part in a simulated escape exercise, and their times (sec) to complete the escape are recorded. The sample mean is sec and the sample standard deviation is sec. Construct a 95% confidence interval on the true average escape time. Interpret your interval. 1/16 Solution to STAT 350 Exam 2 Review Questions ( spring 2015)04/11//2015 2. An investigator wishes to estimate the difference between population mean SAT-M scores of incoming freshmen in the College of Engineering and in the College of Science at Purdue University. The population standard deviations are both roughly 100 points and equal sample sizes are to be selected.

Douglas fir. Type of Wood Sample Size Sample Mean s Red oak 50 8.51 1.52 Douglas fir 62 7.69 3.25 a) Find a 90% confidence interval for the difference between true average proportional stress limits for the Red oak and that for the Douglas fir. Interpret your result.

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STAT 350 Exam 2 Review Problems Spring 2016

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STAT 350 Exam 2 Review Problems Spring 2016 3 2. A random sample of 26 offshore oil workers took part in a simulated escape exercise, and their times (sec) to complete the escape are recorded. The sample mean is 370.69 sec and the sample standard deviation is 24.36 sec. Construct a 95% lower confidence bound on the true average escape time.

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