MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Concept explainers

Estimation
A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.
Question

) Runners in a race have a mean finishing time of 91 minutes and a standard deviation of 16 minutes. If
we assume the runner’s times are normally distributed, answer the following:
a) What is the probability that the finishing time of a single randomly selected runner is within 5 minutes
of the population mean?
b) What is the probability that the sample mean finishing time of 9 runners is within 5 minutes of the
population mean?
c) What is the probability that the sample mean finishing time of 49 runners is within 5 minutes of the
population mean?
d) Compare the probabilities. What does this tell us about the benefits of a large sample size for
estimating the population mean?

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