In the article "Experimental Measurement of the Stopping Performance of a Tractor-Semitrailer from Multiple Speeds", NHTSA, DOT HS 811 48, June 2011, the following stoppingdistances (in feet) for a particular truck at 20mph were given:32.1; 30.6; 31.4; 30.4; 31.0; 31.9Do the sample data suggest the true mean stopping distance exceeds 30 feet? Conduct anappropriate hypothesis test on a=0.05.

Given data 32.1, 30.6, 31.4, 30.4, 31.0, 31.9

Answered: In the article "Experimental…

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 following sample data are from a normal population: Sample size (n) = 25, Sample mean=14, Sample standard deviation=3.6 With 95% confidence, what is the margin of error for the estimation of the population mean?
You may need to use the appropriate appendix table or technology to answer this question. The U.S. Energy Information Administration (US EIA) reported that the average price for a gallon of regular gasoline is $2.94. The US EIA updates its estimates of average gas prices on a weekly basis. Assume the standard deviation is $0.25 for the price of a gallon of regular gasoline and recommend the appropriate sample size for the US EIA to use if they wish to report each of the following margins of error at 95% confidence. (Round your answers up to the nearest whole number.) (a) The desired margin of error is $0.10. (b) The desired margin of error is $0.06. (c) The desired margin of error is $0.04.
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