An article in the Fire Safety Journal (The Effect of Nozzle Design on the Stability and Performance
Question:
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 detennined for several different nozzle designs at six levels of jet efflux velocity. Interest focused on potential differences between nozzle designs, with velocity considered as a nuisance variable. The data are shown below:
(a) Does nozzle design affect the shape factor? Compare the nozzles with a scatter plot and with an analysis of variance, using α = 0.05.
(b) Analyze the residuals from this experiment.
(c) Which nozzle designs are different with respect to shape factor? Draw a graph of the average shape factor for each nozzle type and compare this to a scaled t distribution. Compare the conclusions that you draw from this plot to those from Duncan's multiple range test.
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