Question: Dixon andMassey (1969) presented data on the relationship between IQ scores and results on an achievement test in a general science course. Table 8.3 contains

Dixon andMassey (1969) presented data on the relationship between IQ scores and results on an achievement test in a general science course. Table 8.3 contains a subset of the data.

Fit the simple linear regression model of achievement on IQ and the quadratic model of achievement on IQ and IQ squared. Evaluate both models and decide which is the best.

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