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Name: Suppose you want to find if there is any diffference between the mean
Uploaded: 2024-03-20T07:07:12.000Z
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Description: Suppose you want to find if there is any diffference between the mean (average) lifetime of two types of batteries: ”Energiser” and ”Durasell” batteries. Suppose your random sample of 130 Energiser batteries has an average lifetime of 36.8 days and a

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 you want to find if there is any diffference between the mean (average) lifetime of two types of batteries: ”Energiser” and ”Durasell” batteries. Suppose your random sample of 130 Energiser batteries has an average lifetime of 36.8 days and a random sample of 150 Durasell batteries averages 28.7 days. Assume by prior research that the population standard deviations for the lifetime of Energiser and Duracell batteries are 1.9 days and 2.5 days, respectively. Find the 94% confidence interval in the difference between the mean (average) lifetime of the two types of batteries? State any assumption(s) and/or approximation(s)

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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