Statistics for Engineers and Scientists
4th Edition
ISBN: 9780073401331
Author: William Navidi Prof.
Publisher: McGraw-Hill Education
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Chapter 9, Problem 23SE
To determine
Check whether the mean strength differs for different angles.
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An article in the Fire Safety Journal (“The Effect of Nozzle Design on the Stability and Performance of Turbulent Water Jets,” Vol. 4, August 1981) describes an experiment in which a shape factor was determined for several different nozzle designs at six levels of jet efflux velocity. Interest focused on potential differences between nozzle designs (blocks), with velocity considered as a nuisance variable. The data are shown below:
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11.73
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1.14
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1) Write the null hypothesis and the alternative hypothesis (for the factor).
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7.6
4
4.6
6.1
9.1
3
4.3
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10.4
15.5
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8.8
Compute the least-squares line for predicting depth of wetting (y) from age (x).
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0.84 0.88 0.85 0.95 0.88 0.86 0.85 0.89 0.90 0.94 0.88 0.90
X1
0.81 0.85 0.87 0.92 0.84 0.85 0.85 0.86 0.85 0.92 0.88 0.92
X2
Fit the model y = Bo + fix1 + e. For each coefficient, test the null hypothesis that it is
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equal to 0.
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Chapter 9 Solutions
Statistics for Engineers and Scientists
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