Deep space survey of quasars. Refer to the Astronomical Journal (July 1995) study of quasars detected by a deep space survey. Recall that several quantitative independent variables were were used to model the quasar characteristic, rest frame equivalent width (y). The data for 25 quasars are saved in the QUASAR file.

 (a) Write a complete second-order model for y as a function of redshift (x1), lineflux (x2), and AB1450 (x4).

(b) Fit the model, part a, to the data using a statistical software package. Is the overall model statistically useful for predicting y?

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 (c) Conduct a test to determine if any of the curvilinear terms in the model, part a, are statistically useful predictors of y.

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