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<br />Table 4.-Test for significantly different sample means-Los Angeles area <br /> <br />Item <br /> <br />Estimated mean lifetime <br />San Fernando Costa Mesa- <br />Valley Newport Beach <br />(210 mg/L) (728 mg/L) <br /> <br />Statistical <br />significance <br /> <br />t'~ <br />en <br />0") <br />o <br /> <br />Galvanized waste-water pipe <br />Galvanized water pipe <br />Water heater <br />Toilet-flushing mechanism <br />Copper water pipe <br />Plastic water pipe <br />Copper waste-water pipe <br />Plastic waste-water pipe <br />Dishwasher <br />Clothes washer <br />Garbage disposal <br />Brass faucet <br /> <br />30.94 <br />17.28 <br />8.74 <br />7.68 <br />44.08 <br />48.33 <br />43.82 <br />42.50 <br />9.60 <br />8.50 <br />8.47 <br />10.40 <br /> <br />10.14 <br />11.25 <br />5.22 <br />6.63 <br />47.50 <br />60.00 <br />43.78 <br />53.00 <br />6.50 <br />7.38 <br />6.86 <br />6.00 <br /> <br />Different at 0.005 <br />Different at 0.100 <br />Different at 0.005 <br />No difference <br />No difference <br />No difference <br />No difference <br />No difference <br />Different at 0.005 <br />Different at 0.100 <br />Different at 0.100 <br />Different at 0.050 <br /> <br />Table 5.- Test for significantly different sample means-Las Vegas-Phoenix- Tucson <br /> <br />Item <br /> <br />Estimated mean lifetime <br />Phoenix- <br />Boulder City- <br />Henderson <br />(735 mg/L) <br /> <br />Las Vegas- <br />Tucson <br />(500 mg/LI <br /> <br />Statistical <br />significance <br /> <br />Galvanized waste-water pipe <br />Galvanized water pipe <br />Water heater <br />Toilet-flushing mechanism <br />Dishwasher <br />Clothes washer <br />Evaporative cooler. <br />Garbage disposal <br />Brass faucet <br /> <br />42.23 <br />16.39 <br />7.79 <br />6.18 <br />7.28 <br />8.69 <br />8.96 <br />6.03 <br />9.48 <br /> <br />40.15 <br />19.85 <br />9.66 <br />8.02 <br />9.01 <br />8.63 <br />7.23 <br />7.58 <br />10.28 <br /> <br />No difference <br />Different at 0.05 <br />Different at 0.02 <br />Different at 0.10 <br />Different at 0.02 <br />No difference <br />No difference <br />Different at 0.05 <br />No difference <br /> <br />Table 5.-Present value! of replacing significant household items over 60 years-Los Angeles area <br /> <br />Item <br /> <br />San Fernando <br />Valley <br />(210 mg/L) <br /> <br />Costa Mesa- <br />Newport Beach <br />(728 mg/L) <br /> <br />Difference <br /> <br />Water heater <br />Galvanized waste-water pipe <br />Galvanized water pipe <br />Dishwasher <br />Clothes washer <br />Garbage disposal <br />Brass faucet <br /> <br />342.10 <br />689.71 <br />852.43 <br />450.92 <br />545.24 <br />142.11 <br />85.49 <br /> <br />506.36 <br />1159.46 <br />1083.86 <br />598.51 <br />604.09 <br />165.90 <br />127.43 <br /> <br />164.26 <br />469.75 <br />231.43 <br />147.59 <br />58.85 <br />23.79 <br />41.94 <br /> <br />1 8 percent, 1976 dollars. <br /> <br />12 <br />