Answered: population size = 70, sample size = 40,…

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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population size = 70, sample size = 40, assume the sample follows normal distribution, sample mean = 57, sample standard deviation s = 19, pupulation standard σ is unknown.

a) Find the 90% confidence interval for the average customer score.

b) For the given margin of error 4, what do you think would be the minimum sample size for analyzing the mean customer score with 90% confidence?

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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