Answered: The 2008 Rambler Roadhog automobiles…

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 2008 Rambler Roadhog automobiles had mean gas mileage μ = 16.8 mpg, with
standard deviation σ = 3.2 mpg. The Roadhog was completely redesigned for 2009 to
meet federal mandates. A random sample of 1200 of the 2009 Roadhogs revealed mean
gas mileage = 17.0 mpg. It is reasonable to assume that σ did not change in the
redesign.
Is there significant evidence that the mean gas mileage of the 2009 Roadhog is
greater than 16.8 mph? Set up appropriate null and alternative hypotheses,
calculate the appropriate test statistic, find the P-value, and state your
conclusion (using level of significance α = .01).

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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