# E Text Ch8 - E-Text Assignment 1 E-Text Assignment Chapter...

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E-Text Assignment 1 E-Text Assignment Chapter 8 E-Text Assignment Chapter 8 Neil Robinson Research and Evaluation II RES 342 University of Phoenix

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E-Text Assignment 2 8.49 Sixteen owners of 2005 Chrysler Pacifica 2WD vehicles kept track of their average fuel economy for a month. The results are shown below. (a) Construct a 95 percent confidence interval for the mean. (b) What factor(s) limit the conclusions that can be drawn about the true mean? (Data are from www.fueleconomy.gov. ) MPG 20.8, 20.0, 19.4, 19.7, 21.1, 22.6, 18.3, 20.1, 20.5, 19.5, 17.4 22.4 18.9 20.2 19.6 19.0 (A) Mean: 19.96875 Std Dev: 1.351 T-value (with df=15) = 2.1315 . ± . × . 19 969 2 1315 1 351 16 . < < . 19 249 μ 20 679 Given information from 16 different Chrysler Pacifica 2WD vehicles, we are 95% sure that the average mile per gallon for all Chrysler Pacifica 2WD’s is between 19.3 miles per gallon and 20.6 miles per gallon. (B) A few factors that can limit the conclusion of the true mean, is driving style of the owner, vehicle condition, driving conditions, and variables like climate driven in as well. (Lovell, 1986) 8.63 The State of Michigan tested 766 water samples from private wells in Lapeer County, Michigan,

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