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Name: A group is interested in seeing if the mean gas mileages from two diff
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Description: A group is interested in seeing if the mean gas mileages from two different brands of gasoline are the same. To test this, they sampled 20 cars that used Type A gas and 16 cars that used Type B gas. From these samples, they calculated the following d

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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A group is interested in seeing if the mean gas mileages from two different brands of gasoline are the same. To test this, they sampled 20 cars that used Type A gas and 16 cars that used Type B gas. From these samples, they calculated the following descriptive statistics (in terms of miles per gallon):

	Type A Gas	Type B Gas
?n	20	16
?⎯⎯⎯x¯	29	29
?s	4	7

(Assume the samples are independent and that the populations are normally distributed with unknown mean and standard deviation)

(a) Is there significant evidence to suggest that there is a difference in gas milage? Test this at the ?=0.05α=0.05 significance level. State your conclusions regarding H₀

(b) Calculate a 95% confidence interval for the true difference of the means. State your conclusions after calculating the interval.

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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