Answered: Assume that the population has a normal…

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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Assume that the population has a normal distribution. use a 95% Confidence level.

In a survey of 3005 adults aged 57 through 85 years, it was found that 82% of them use at least one prescription medication.

1. How many people use at least one prescription medication.

2. Find the margin of error E that corresponds to a 95% confidence level.

3. Find the 95% confidence interval estimate of the population proportion p.

4. How many people must be surveyed if we want a confidence level of 99% and a margin of error of four percentage points? Use the sample proportion is 82%.

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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