Question: In a study of paint peel problems, a regression was suggested to predict defects per million (the response variable). The intended predictors were supplier (four

In a study of paint peel problems, a regression was suggested to predict defects per million (the response variable). The intended predictors were supplier (four suppliers, coded as binaries) and substrate (four materials, coded as binaries). There were 11 observations. Explain why regression is impractical in this case, and suggest a remedy.

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