IEE 380 ASU Applied Statistics and Probability for Engineers Questions

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jlj123

Mathematics

IEE 380

Arizona State University

IEE

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4 questions form Montgomery & Runger, Applied Statistics and Probability for Engineers, 6th Edition.

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Question 12 An article in Engineering Horizons (Spring 1990, p. 26) reported that 117 of 484 new engineering graduates were planning to continue studying for an advanced degree. Consider this as a random sample of the 1990 graduating class. Round your answers to 3 decimal places. (a) Find a 90% confidence interval on the proportion of such graduates planning to continue their education. Osps (b) Find a 95% confidence interval on the proportion of such graduates planning to continue their education. sps (c) The 90% confidence interval is the 95% confidence interval. Statistical Tables and Charts wider than narrower than the same width as Actual lengths of stay at a hospital's emergency department in 2009 are shown in the following table (rounded to the nearest hour). Length of stay is the total of wait and service times. Some longer stays are also approximated as 15 hours in this table. Hours Count 1 2 3 4 + 5 6 7 14 46 73 13 105 105 70 70 62 62 37 18 18 17 15 10 8 o 9 10 15 Calculate the probability mass function of the length of stay. Round your answers to four decimal places (e.g. 98.7654). X 1 3 f(x) х 5 f(x) х 9 10 15 f(x) An Article in the Journal of Sports Science (1987, Vol. 5, pp. 261-271) presents the results of an investigation of the hemoglobin level of Canadian Olympic ice hockey players. A random sample of 20 players is selected and the hemoglobin level is measured. The resulting sample mean and standard deviation(g/dl) are X = 15.38 and S = 0.6166. Use this information to calculate a 95% two-sided confidence interval on the mean hemoglobin level and a 95% two-sided confidence interval on the variance. Assume the data are normally distributed. Round your answers to 2 decimal places. O sus sos Statistical Tables and Charts An Izod impact test was performed on 20 specimens of PVC pipe. The sample mean is x = 1.10 and the sample standard deviation is s = 0.29. Find a 99% lower confidence bound on the true Izod impact strength. Assume the data are normally distributed. Round your answer to 3 decimal places. s the absolute tolerance is +/-0.001
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