Answered: 3. "An electrical firm produces light…

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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3. "An electrical firm produces light bulbs that have a length of life that is approximately normally distributed with a mean of 840 hours and a population standard deviation of 27 hours. A new version of light bulbs is being produced and is assumed to be better than the previous version. To test this claim, a random sample of 69 new light bulbs are tested. Would you buy the new version of the light bulb or would you buy the older version if the random sample showed an average of 760 hours? Use a 0.01 level of significance."
a. I will buy the older version until there is sufficient evidence to do otherwise.
b. I will certainly buy the older version because I am 100% sure it is better.
c. I will buy the new version.
d. There is no sufficient data to make a sound conclusion.
03:44 PM

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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