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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Material strength investigations provide a rich area of application for statistical meth ods.
The article “Effects of Aggregates and Microfillers on the Flexural Properties of
Concrete” (Magazine of Concrete Research, 1997: 81–98) reported on a study of
strength properties of high-performance concrete obtained by using superplasticizers
and certain binders. The compressive strength of such concrete had previously
been investigated, but not much was known about flexural strength (a measure of
ability to resist failure in bending). The accompanying data on flexural strength (in
MegaPascal, MPa, where 1 Pa (Pascal) 5 1.45 3 1024 psi) appeared in the article
cited:
5.9 7.2 7.3 6.3 8.1 6.8 7.0 7.6 6.8 6.5 7.0 6.3 7.9 9.0
8.2 8.7 7.8 9.7 7.4 7.7 9.7 7.8 7.7 11.6 11.3 11.8 10.7
Suppose we want an estimate of the average value of flexural strength for all beams
that could be made in this way (if we conceptualize a population of all such beams,
we are trying to estimate the population mean). It can be shown that, with a high
degree of confidence, the population mean strength is between 7.48 MPa and
8.80 MPa; we call this a confidence interval or interval estimate. Alternatively, this
data could be used to predict the flexural strength of a single beam of this type. With
a high degree of confidence, the strength of a single such beam will exceed
7.35 MPa; the number 7.35 is called a lower prediction bound.

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