18th Edition

ISBN: 9781265679637

Author: Lind

Publisher: MCG

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A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

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Textbook Question

Chapter 3, Problem 4E

a. Compute the mean of the following sample values: 1.3, 7.0, 3.6, 4.1, 5.0.
b. Show that Σ ( x − x ¯ ) = 0 .

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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Chapter 3, Problem 3E

Chapter 3, Problem 5E

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Chapter 3 Solutions

STAT. TECH. FOR BUSINESS AND ECO (LL)

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a. Compute the mean of the following sample values: 1.3, 7.0, 3.6, 4.1, 5.0. b. Show that Σ ( x − x ¯ ) = 0 .

Solution Summary: The author calculates the sample mean, which is the sum of all data values in a sample, divided by the total number of data.

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