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Name: A utility company claims that their customers’ mean annual electric co
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Description: A utility company claims that their customers’ mean annual electric consumption amount is 11,000 kWh. A random sample of annual electric consumptions for 12 customers resulted in a mean of 10,679 and a standard deviation of 914. At the 0.01 level o

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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A utility company claims that their customers’ mean annual electric consumption amount is 11,000 kWh. A random sample of annual electric consumptions for 12 customers resulted in a mean of 10,679 and a standard deviation of 914. At the 0.01 level of significance test the company’s claim.. Assume that the electric energy consumption is normally distributed.

H₀: _____________ check criteria:

H_A: ___________

Label the claim next to the correct hypothesis above.

Critical value_________

Test statistic (show work)

Decision______________________________

Include a sketch supporting your decision.

Conclusion in your own words_

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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