1. The efficiency ratio for a steel specimen immersed in a phosphating tank is the weight of...

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1. The efficiency ratio for a steel specimen immersed in a phosphating tank is the weight of the phosphate coating divided by the metal loss (both in mg/ft2

). The article

“Statistical Process Control of a Phosphate Coating Line”

(Wire J. Intl., May, 1997: 78–81) gave the accompanying data on tank temperature (x) and efficiency ratio (y).

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