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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_

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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