Answered: A manufacturing company produces…

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 manufacturing company produces bearings. One line of bearings is specified to be 1.64 centimeters (cm) in
diameter. A major customer requires that the variance of the bearings be no more than 0.001 cm2. The producer is
required to test the bearings before they are shipped, and so the diameters of 16 bearings are measured with a
precise instrument, resulting in the following values:

1.69 1.62 1.63 1.70 1.66 1.63 1.65 1.71 1.64 1.69 1.57 1.64 1.59 1.66 1.63 1.65

Assume bearing diameters are normally distributed. Use the data and α = 0.025 to test the data to determine whether
the population of these bearings is to be rejected because of too high variance.

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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