Answered: Suppose x has a normal distribution…

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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Suppose x has a normal distribution with mean μ = 50 and standard deviation σ = 11.

Describe the distribution of x values for sample size n = 4. (Round σ_x to two decimal places.)

μ_x	=
σ_x	=

Describe the distribution of x values for sample size n = 16. (Round σ_x to two decimal places.)

μ_x	=
σ_x	=

Describe the distribution of x values for sample size n = 100. (Round σ_x to two decimal places.)

μ_x	=
σ_x	=

How do the x distributions compare for the various samples sizes?

The means are the same, but the standard deviations are decreasing with increasing sample size.The means are the same, but the standard deviations are increasing with increasing sample size. The means and standard deviations are the same regardless of sample size.The standard deviations are the same, but the means are decreasing with increasing sample size.The standard deviations are the same, but the means are increasing with increasing sample size.

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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