Question: An article in Environment International (Vol. 18, No. 4, 1992) describes an experiment in which the amount of radon released in showers was investigated. Radon-enriched

An article in Environment International (Vol. 18, No. 4, 1992) 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 shower heads. The data from the experiment are shown in the following table.

a) Does the size of the orifice affect the mean percentage of radon released? Use a = 0.05.
(b) Find the P-value for the F-statistic in part (a).
(c) Analyze the residuals from this experiment.
(d) Find a 95% confidence interval on the mean percent of radon released when the orifice diameter is 1.40.

Orifice Diameter Radon Released (%) 0.37 83 83 85 80 0.51 75 75 79 79 0.71 77 74 73 76 1.02 67 72 74 74 1.40 62 62 67 69

Orifice Diameter Radon Released (%) 0.37 83 83 85 80 0.51 75 75 79 79 0.71 77 74 73 76 1.02 67 72 74 74 1.40 62 62 67 69 1.99 60 61 64 66

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