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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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The table below shows results for the margin of error in a 95% confidence interval for the difference between government sector workers and private sector workers in the mean number of hours they work each week. You are going to conduct a significance test investigating the null hypothesis that there is no difference between the population mean number of hours worked each week by government and private sector workers, using an α-level (alpha level) of .05 and H a : μ 1 ≠ μ 2 . What is your decision about the null hypothesis?

Estimate of Difference of Means:
Point Estimate	Standard Error	t-score (df=388.6)	Margin of Error
-0.122	0.954	1.97	± 1.875

Would you reject the null hypothesis or fail to reject the null hypothesis?

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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