The efficiency ratio for a steel specimen immersed in a phosphatingtank is the weight of
Chapter 12, Problem 1(choose chapter or problem)
The efficiency ratio for a steel specimen immersed in a phosphatingtank is the weight of the phosphate coating dividedby the metal loss (both in mg/ft2). The article StatisticalProcess Control of a Phosphate Coating Line (Wire J. Intl.,May 1997: 7881) gave the accompanying data on tank temperature(x) and efficiency ratio (y).Temp. 170 172 173 174 174 175 176Ratio .84 1.31 1.42 1.03 1.07 1.08 1.04Temp. 177 180 180 180 180 180 181Ratio 1.80 1.45 1.60 1.61 2.13 2.15 .84Temp. 181 182 182 182 182 184 184Ratio 1.43 .90 1.81 1.94 2.68 1.49 2.52Temp. 185 186 188Ratio 3.00 1.87 3.08a. Construct stem-and-leaf displays of both temperature andefficiency ratio, and comment on interesting features.b. Is the value of efficiency ratio completely and uniquelydetermined by tank temperature? Explain your reasoning.c. Construct a scatter plot of the data. Does it appear thatefficiency ratio could be very well predicted by the valueof temperature? Explain your reasoning.
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