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Refer to The Astronomical Journal study of quasars presented in

Refer to The Astronomical Journal study of quasars, presented in Exercise. Recall that a first-order model was used to relate a quasar’s equivalent width (y) to its redshift (x1), line flux (x2), line luminosity (x3), and AB1450 (x4). A portion of the SPSS spreadsheet showing 95% prediction intervals for y for the first five observations in the data set is reproduced below. Interpret the interval corresponding to the fifth observation.

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