Answered: A certain size of tires is supposed to…

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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Question

A certain size of tires is supposed to be inflated to 35 psi. The owner of a vehicle repair shop would like to test the hypotheses =35 versus 35 where μ = the true mean tire pressure for all customers with this tire size. A 90% confidence interval based upon a random sample of 40 customers is (32.1, 34.3). Using the interval, can the owner reject the null hypothesis?

Yes, the null hypothesis can be rejected at the significance level α = 0.05 because 35 is not contained in the 90% confidence interval.

Yes, the null hypothesis can be rejected at the significance level α = 0.10 because 35 is not contained in the 90% confidence interval.

No, the null hypothesis cannot be rejected at the significance level α = 0.05 because 35 is not contained in the 90% confidence interval.

No, the null hypothesis cannot be rejected at the significance level α = 0.10 because 35 is not contained in the 90% confidence interval.

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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