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Description: Independent random samples of business and economics faculty were asked to respond on a scale from 1 (strongly disagree) to 4 (strongly agree) to this statement: The threat and actuality of takeovers of publicly held companies provide discipline for

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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Independent random samples of business and economics faculty were asked to respond on a scale from 1 (strongly disagree) to 4 (strongly agree) to this statement: The threat and actuality of takeovers of publicly held companies provide discipline for boards and managers to maximize the value of the company to shareholders. For a sample of 202 business faculty, the mean response was 2.83 and the sample standard deviation was 0.89. For a sample of 291 economics faculty, the mean response was 3.00 and the sample standard deviation was 0.67. Test the null hypothesis that the population means are equal against the alternative that the mean is higher for economics faculty.

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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