An article in Environmental International describes an experiment in which the amount of radon released in showers was investigated. Radon-enriched water was used in the experiment, and six different orifice diameters were tested in showerheads. The data from the experiment are shown in Table 4E.7.

(a) Does the size of the orifice affect the mean percentage of radon released? Use the analysis of variance and a = 0.05.
(b) Analyze the residuals from this experiment.

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TABLE 4E.7 Radon Data for the Experiment in Exercise 4.41 Orilice Diameter 0.37 051 0.71 1.02 1.40 1.99 Radon Released (%) 80 83 3 85 75 75 79 79 74 67 72 74 62 60 61 6 66 73 76 77 62 67 69