Answered: Candidates for employment at a city…

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

Candidates for employment at a city fire department are required to take a
written aptitude test. Scores on this test are normally distributed with a
mean of 280 and a standard deviation of 60. A random sample of nine test
scores was taken.
• a. What is the standard error of the sample mean score?
• b. What is the probability that the sample mean score is less than 270?
• c. What is the probability that the sample mean score is more than 250?
• d. Suppose that the population standard deviation is, in fact, 40, rather
than 60. Without doing the calculations, state how this would change your
answers to parts (a), (b), and (c). Illustrate your conclusions with the
appropriate graphs.

Thank you for your answers, I'm reposting the question for the answer to subpart d

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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