Flexural strength is a measure of a material's ability to resist failure in bending. The accompanying data are on flexural strength of concrete (in MegaPascal, MPa, where 1 Pa (Pascal) = 1.45 ⨯ 10−4 psi): 5.6 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 11.2 11.8 10.5 (a) Construct a stem-and-leaf display of the data. (Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.) Answer: Stems Leaves 5 6 7 8 9 10 11 What appears to be a representative strength value? Answer:______ MPa Do the observations appear to be highly concentrated about the representative value or rather spread out? Answer: highly concentrated around the representative value spread out with a large range (b) Does the display appear to be reasonably symmetric about a representative value, or would you describe its shape in some other way? Answer: _reasonably symmetric positive skewness negative skewness completely random distribution (c) Do there appear to be any outlying strength values? Yes or No (d) What proportion of strength observations in this sample exceed 10 MPa? (Round your answer to two decimal places.) Answer:__________

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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Flexural strength is a measure of a material's ability to resist failure in bending. The accompanying data are on flexural strength of concrete (in MegaPascal, MPa, where 1 Pa (Pascal) = 1.45 ⨯ 10⁻⁴ psi):

5.6	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	11.2	11.8	10.5

(a) Construct a stem-and-leaf display of the data. (Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.)

Answer:

Stems	Leaves
5
6
7
8
9
10
11

What appears to be a representative strength value?
Answer:____________ MPa

Do the observations appear to be highly concentrated about the representative value or rather spread out?

Answer:

______highly concentrated around the representative value

______spread out with a large range

(b) Does the display appear to be reasonably symmetric about a representative value, or would you describe its shape in some other way?

Answer:

_____reasonably symmetric

____positive skewness

____negative skewness

____completely random distribution

Yes or No

(d) What proportion of strength observations in this sample exceed 10 MPa? (Round your answer to two decimal places.)

Answer:____________

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