Answered: 771 Mainers participated in an…

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

771 Mainers participated in an automated survey performed by Public Policy Polling while voting.62% think elected officials do what is best for their party instead of what is best for Maine citizens. Assuming the results of the survey follow a normal distribution.

a) Calculate a 90% confidence interval on the true proportion of Maine voters who think elected officials do what is best for their party instead of what is best for Maine citizens.

b) Calculate a 99% confidence interval on the true proportion of Maine voters who think elected officials do what is best for their party instead of what is best for Maine citizens.

c) Which confidence interval is larger and why?

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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