INTRO. STATISTICAL QUALITY CONTROL
13th Edition
ISBN: 9781118909447
Author: Montgomery
Publisher: WILEY
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Chapter 4, Problem 37E
An article in the ACI Materials Journal (Vol. 84, 1987, pp. 213–216) describes several experiments investigating the rodding of concrete to remove entrapped air. A 3-in.-diameter cylinder was used, and the number of times this rod was used is the design variable. The resulting compressive strength of the concrete specimen is the response. The data are shown in Table 4E.5.
TABLE 4E.5
Compressive Strength Data for Exercise 4.37
- (a) Is there any difference in compressive strength due to the rodding level? Answer this question by using the analysis of variance with α = 0.05.
- (b) Construct box plots of compressive strength by rodding level. Provide a practical interpretation of these plots.
- (c) Construct a normal
probability plot of the residuals from this experiment. Does the assumption of anormal distribution for compressive strength seem reasonable?
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Chapter 4 Solutions
INTRO. STATISTICAL QUALITY CONTROL
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