# 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)
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## This note was uploaded on 06/28/2010 for the course RES 342 RES 342 taught by Professor Davidlantz during the Spring '10 term at University of Phoenix.

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

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