38. A new drug was tested on mice to determine its effectiveness in reducing cancerous tumors. Tests were run on 10 mice, each having a tumor of size 4 grams, by varying the amount of the drug used and then determining the resulting reduction in the weight of the tumor. The data were as follows:

Estimate the maximum expected tumor reduction and the amount of the drug that attains it by fitting a quadratic regression equation of the form

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Coded Amount of Drug Tumor Weight Reduction 1 .50 234567890 10 .90 1.20 1.35 1.50 1.60 1.53 1.38 1.21 .65