Answered: A financial services firm is interested…

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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Question

A financial services firm is interested in investigating the cost of exporting a company’s products in 4 regions worldwide. The financial analysts collect data of the cost associated with compliance of the economy’s customs regulations to export a shipment in 10 countries (in US$) selected from each of 4 regions. They would like to investigate whether the average costs of exporting differ across the four regions. The null hypothesis H0 for this analysis is:

Select one:

At least one of the populations of exporting costs has a different mean among the four regions.

Not all the populations of exporting costs have the same mean among the four regions.

There is no difference in the population means of exporting costs among the four regions.

None of these

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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