Answered: A random sample of 25 observations…

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 random sample of 25 observations selected from this population gave a mean equal to 143.72. The population is known to have a normal distribution with the standard deviation of 14.8. Using a 95% confidence level.

I) Determine the standard error:

II) Determine the point estimate of _u:

III) Determine confidence interval of _u:

IV) Determine the reliability factor:

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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