The article "Uncertainty Estimation in Railway Track Life CycleCost" (J. of Rail and Rapid Transit, 2009) presented the following data on time to repair (min) arail break in the high rail on a curved track of a certain railway line.159 120 480 149 270 547 340 43 228 202 240 218It is plausible that the population distribution of repair time is approximately normal. The samplemean and standard deviation are 249.7 and 145.1, respectively. Is there compelling evidence forconcluding that true average repair time exceeds 200 min? Perform a test of hypotheses using asignificance level of 0.05.

For the provided sample distribution of repair time of 12 observations (i.e., n=12), it is specified…

Answered: The article "Uncertainty Estimation in…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The number of heart surgeries performed at a hospital has increased over the past several years. The hospital’s administration is seeking the best method to forecast the demand for such surgeries in Year 6. The data for the past five years is shown. Year Demand 1 130 2 139 3 135 4 144 5 141 The hospital is considering the following forecasting methods. Compare the performance of these methods using the mean squared error (MSE). Begin error measurements in year 3 so all methods are compared for the same years. Exponential smoothing, with α = 0.5. let the initial forecast for year 1= 130, the same as the actual demand. Two-year simple moving average Two-year weighted moving average, using weights 0.7 and 0.3, with more recent data given more weight. Solve this problem on a separate paper. Then, use the results to complete the tables provided below, save the file and then submit it on E-learning. 1- Exponential smoothing: Year Forecast…
Can we use the standard deviation to compare variability of two or more datasets? Is the z-score a real measure of dispersion? If the data is highly skewed, can we still rely on the kurtosis coefficient?
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An article in Knee Surgery Sports Traumatology, Arthroscopy, "Effect of provider volume on resource utilization for surgical procedures," (2005, Vol. 13, pp. 273-279) showed a mean time of 116 minutes and a standard deviation of 18 minutes for ACL reconstruction surgery for high-volume hospitals (with more than 300 such surgeries per year). If a high-volume hospital needs to schedule 10 surgeries, what is the mean and variance of the total time to complete these surgeries? Assume the times of the surgeries are independent and normally distributed. Mean = i Variance = i minutes minutes²
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