Answered: A thread manufacturer tests a sample of…

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 thread manufacturer tests a sample of 36 lengths of a certain type of thread made of blended materials from a production run of a total of 260 and obtains a mean tensile strength of 9.34 lbs. The population standard deviation for the 260 items has always been .04 Ib. a. Assuming tensile strengths are normally distributed, construct a 95% confidence interval for the mean tensile strength of this thread.

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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