Answered: In an experiment done by the…

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

In an experiment done by the engineering students, the following data on the comparison
between illuminance of a mirror immediately after application of a surface finish solution and
after 7 days of storage were recorded. Assuming the populations to be normally distributed, is
there sufficient evidence, at the 0.05 level of significance, to say the length of storage influences
illuminance in mirrors?

Illuminance in candela/square meter (cd/)
Sheet
Before Storage
After Storage
1
504
328
424
299
3
399
239
4
400
329
5
590
437
660
567
7
700
689
8
680
576
2.

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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