Solved: The Department of Civil Engineering at Virginia
Chapter 1, Problem 9.94(choose chapter or problem)
The Department of Civil Engineering at Virginia Tech compared a modied (M-5 hr) assay technique for recovering fecal coliforms in stormwater runo from an urban area to a most probable number (MPN) technique. A total of 12 runo samples were collected and analyzed by the two techniques. Fecal coliform counts per 100 milliliters are recorded in the following table. Sample MPN Count M-5 hr Count 1 2 3 4 5 6 7 8 9 10 11 12 2300 1200 450 210 270 450 154 179 192 230 340 194 2010 930 400 436 4100 2090 219 169 194 174 274 183Construct a 90% condence interval for the dierence in the mean fecal coliform counts between the M-5 hr and the MPN techniques. Assume that the count differences are approximately normally distributed.
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