Answered: What Proportion of Americans Say They…

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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What Proportion of Americans Say They Are Poor? A survey of 1000 US Adults conducted in October 2019 found that 182 of them described themselves as poor. In Exercise 3.128, we used a bootstrap distribution to find a 90% confidence interval for the proportion of all US adults who would describe themselves as poor. Here, we find this 90% confidence interval using the normal distribution and a formula for the standard error, as follows:

(a) Give value for the sample statistic.
Value = .

(b) Find the standard error for this sample statistic. Round to three decimal places.

(d) Use the results of (a), (b), and (c) to find the 90% confidence interval. Round to three decimal places.
to

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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