Answered: An researcher found that a random…

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

An researcher found that a random sample of 30 used cars in a town had a mean gas mileage (mpg) of 19.5 miles per gallon with a sample standard deviation of 3.9 miles per gallon. Assume the population of miles per gallon (mpg) values is normally distributed. Calculate the margin of error, E, for a 95% confidence interval for µ, the average miles per gallon of all used cars in the town.

	A.	1.78
	B.	1.40
	C.	1.46
	D.	1.44

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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