A government agency wants to test an oil company's advertising claim according to which cars will run the same miles on a tankful of its regular gas as on a tankful of a competitor's (more expensive and allegedly superior) gasohol. Twenty identical cars are randomly selected. Half are filled with gasoline and half with gasohol. The resulting mileages appear in the following Table. Make a Wilcoxon Rank-sum test at the 5 percent level of significance. TABLE: Miles Driven before Fuel Exhaustion On Gasoline (A) On Gasohol (B) 350 352 372 375 348 351 371 375 381 391 392 390 353 360 388 393 388 394 373 379

A government agency wants to test an oil company's advertising claim according to which cars will run the same miles on a tankful of its regular gas as on a tankful of a competitor's (more expensive and allegedly superior) gasohol. Twenty identical cars are randomly selected. Half are filled with gasoline and half with gasohol. The resulting mileages appear in the following Table. Make a Wilcoxon Rank-sum test at the 5 percent level of significance. TABLE: Miles Driven before Fuel Exhaustion On Gasoline (A) On Gasohol (B) 350 352 372 375 348 351 371 375 381 391 392 390 353 360 388 393 388 394 373 379

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Description: A government agency wants to test an oil company's advertising claim according to whichcars will run the same miles on a tankful of its regular gas as on a tankful of a competitor's(more expensive and allegedly superior) gasohol. Twenty identical ca

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 government is interested to estimate the proportion of families gathering in the weekends, in a city. The city is divided into three blocks. A stratified random sample of 60 households was selected proportionately from each block considering the blocks as strata. The summary data of the survey are presented in the following table. Stratu Ni m (i) X; Mean Si Pi 1 120 18 35.0 4.0 0.5 0.2 0.9 130 15 20.0 5.0 180 27 30.0 6.0 25 i) Estimate the proportion of family gathering in the weekend, and obtain a 95% confidence interval of your estimate. Interpret the results. ii) Find the appropriate sample size and its allocation for estimating the total family gathering, with a bound of 50 points on the error of estimation. Assume that the stratum standard deviations are o1=8, 02=12 and, o3=4. LO NO LO CO 23
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The government is interested to estimate the proportion of families gathering in the weekends, in a city. The city is divided into three blocks. A stratified random sample of 60 households was selected proportionately from each block considering the blocks as strata. The summary data of the survey are presented in the following table. Stratu Ni m (i) |X; Mean S; Pi 1 120 18 35.0 4.0 0.5 О.2 0.9 130 15 20.0 5.0 180 27 30.0 6.0 25 i) Estimate the proportion of family gathering in the weekend, and obtain a 95% confidence interval of your estimate. Interpret the results. ii) Find the appropriate sample size and its allocation for estimating the total family gathering, with a bound of 50 points on the error of estimation. Assume that the stratum standard deviations are o1=8, 02=12 and , o3=4. LO NO Oold 23
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