Answered: The diameter of a certain shaft is…

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

The diameter of a certain shaft is normally distributed with a mean expected to be 2.79 cm and a standard deviation of 0.01 cm. The specification limits are 2.77 ± 0.03.
a) If 1000 shafts are produced, how many can we expect will be unacceptable?
b) If the sample mean for 1000 shafts is 2.786 cm, what are the 99% confidence limits for the true mean diameter?
c) What is the probability that a single diameter measurement will deviate from the true mean by at least 0.02 cm?
d) Estimate the required size of the random sample in future measurements so that the 95% confidence interval for the population mean will not differ from the sample
mean by more than 0.01 cm.

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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