Answered: A survey is conducted to learn about…

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

A survey is conducted to learn about home broadband usage in Irish Households. A sample of 10 households with home broadband had an average monthly usage of 190GB and varied with a standard deviation of 28GB. Which of the following is a 95% confidence interval for the true mean monthly broadband usage for the population of all Irish Households if we assume the variable, monthly broadband usage, has a normal distribution for the population?

(a) 190±14.61. (b) 190±16.23. (c) 190±17.35.

(d) 190±20.03 (e) 190±22.84.

(f) 190±54.88 (g) 190 ± 63.34.

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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