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 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. Orifice Diameter Radon Released (%) 0.37 80 82 83 85 0.51 75 75 79 79 0.71 74 73 76 77 1.02 67 72 74 74 1.40 62 62 66 69 1.99 60 61 64 66 (a) Does the size of the orifice affect the mean percentage of radon released? Use a = 0.05. Round all intermediate calculations to four decimal places (e.g. 12.3456). 30.8518 Since Fo = V in the rejection region, there is sufficient evidence to conclude that the mean percentage varies according to orifice diameter. (b) Find bounds on the P-value for the F-statistic in part (a). Use only Table VI of Appendix A. P-value o Statistical Tables and

Answer 1

a) Fo = 31.4101 is in the rejection region, there is sufficient evidence to conclude that the mean percentage varies according to orifice diameter. b) P-value o

SS df F P-value ANOVA Source of Variation Between Groups Within Groups Total MS 5 225.5417 Fcrit 2.7729 31.4101 0.0000 1127.708 129.250 18 7.1806 1256.958 23