Answered: Ten years after graduation, the…

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

Ten years after graduation, the salaries of Heriot-Watt University graduates are Normally distributed with a mean of £55,000, and a standard deviation of £11,000. We find that the 90% confidence interval for salaries runs from approximately £37,000 to £73,000. We interpret this as meaning that

a) 90% of graduates earn at least £37,000

b) There is a probability of 0.9 that the average earnings of graduates lies between £37,000 and £73,000

c) The probability of a graduate chosen at random earning between £37,000 and £73,000 is 0.9

d) 90% of graduates earn no more than £73,000

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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