The owner of a gasoline station wants to study gasoline purchasing habits by motorists at his station. He selects a random sample of 55 motorists during a certain week, with the following results: • The amount purchased was XBar = 11.0gallons, S = 3.3 gallons. • 15 motorists purchased premium-grade gasoline. a. At the 0.05 level of significance, is there evidence that the population mean purchase was different from 10 gallons? What is your answer to (a) if the sample mean equals 11.3 gallons? What is your answer to (c) if 7 motorists purchased premium gasoline?
The owner of a gasoline station wants to study gasoline purchasing habits by motorists at his station. He selects a random sample of 55 motorists during a certain week, with the following results: • The amount purchased was XBar = 11.0gallons, S = 3.3 gallons. • 15 motorists purchased premium-grade gasoline. a. At the 0.05 level of significance, is there evidence that the population mean purchase was different from 10 gallons? What is your answer to (a) if the sample mean equals 11.3 gallons? What is your answer to (c) if 7 motorists purchased premium gasoline?
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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Question
The owner of a gasoline station wants to study gasoline purchasing habits by motorists at his station. He selects a random sample of 55 motorists during a certain week, with the following results:
• The amount purchased was XBar = 11.0gallons, S = 3.3 gallons.
• 15 motorists purchased premium-grade gasoline.
a. At the 0.05 level of significance, is there evidence that the population mean purchase was different from 10 gallons?
What is your answer to
What is your answer to
(a) if the sample mean equals 11.3 gallons?
What is your answer to
(c) if 7 motorists purchased premium gasoline?
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