Answered: An article in Environment International…

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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APPLIED STATISTICS AND PROBABILITY FOR ENGINEERS

> COMPLETELY RANDOMIZED DESIGN

An article in Environment International [“Influence of Water Temperature and Shower Head Orifice Size on the Release of Radon During Showering” (1992, Vol. 18(4), pp. 363–369)] described an experiment in which the amount of radon released in showers was investigated. Radon-enriched water was used in the experiment, and six different orifice diameters were tested in shower heads. The data from the experiment are shown in the following table.

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Answer the following:

a. Does the size of the orifice affect the mean percentage of radon released? Use α = 0.05.
b. Find the P-value for the F-statistic in part (a).
c. Analyze the residuals from this experiment.
d. Find a 95% confidence interval on the mean percent of radon released when the orifice diameter is 1.40.

Orifice Diameter
0.37
0.51
0.71
1.02
1.40
1.99
Radon Released (%)
85
79
77
74
69
66
80 83 83
75
75 79
74
73
76
67
72
74
62
62 67
60
61
64

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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