An auto battery company claims that their batteries mean life is 50 months. In order to check this claim, a DTI researcher took a random sample of 18 of these batteries and found that the mean life is 48.8 months with standard deviation of 7 months. Assume that the battery life follows a normal distribution, test with 90% confidence whether the companies claim is different from the true mean.

Name: An auto battery company claims that their batteries mean life is 50 mo
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Description: An auto battery company claims that their batteries mean life is 50 months. In order to check this claim, a DTI researcher took a random sample of 18 of these batteries and found that the mean life is 48.8 months with standard deviation of 7 months.

It is given that, An auto battery company claims that their battery's life is 50 months i.e. μ =50,…

Answered: An auto battery company claims that…

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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An auto battery company claims that their batteries mean life is 50 months. In order to check this claim, a DTI researcher took a random sample of 18 of these batteries and found that the mean life is 48.8 months with standard deviation of 7 months. Assume that the battery life follows a normal distribution, test with 90% confidence whether the companies claim is different from the true mean.

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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