Answered: We wish to give a 95% confidence…

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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We wish to give a 95% confidence interval for μ₁-μ₂. Here, μ₁ denotes the mean value of the random variable Y₁ defined on Population 1, and μ₂ denotes the mean value of the random variable Y₂ defined on Population 2. In order to develop the confidence interval we have obtained independent random samples of sizes 5 and 7 from Population 1 and Population 2, respectively. For Population 1 we find a sample mean value of 12 with a sample standard deviation of 9, while the Population 2 sample has a mean value of 9 with a sample standard deviation of 10. Assume the Y₁ and Y₂ are normally distributed and have equal variances. Find the pooled estimate of the common variance.

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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