Sixteen cars are first driven with a standard fuel and then with Petrocoal, a gasoline with a

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Sixteen cars are first driven with a standard fuel and then with Petrocoal, a gasoline with a methanol additive. The results of the nitrous oxide emissions (NOX) test are as follows:

Type of fuel	Average NOX	Standard deviation of NOX
Standard	1.075	0.5796
Petrocoal	1.159	0.6134

Source: Michael O. Finkelstein and Bruce Levin, Statistics for Lawyers, Springer-Verlag, New York, 1990, p. 230.

a. How would you test the hypothesis that the two population standard deviations are the same?

b. Which test did you use? What are the assumptions underlying that test?

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Essentials of Econometrics

ISBN: 978-0073375847

4th edition

Authors: Damodar Gujarati, Dawn Porter

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Posted Date: Apr 27, 2021 11:52 AM

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Sixteen cars are first driven with a standard fuel and then with Petrocoal, a gasoline with a

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