An article published in Geography (July 1980) used multiple regression to predict annual rainfall levels in California. Data on the average annual precipitation (y), altitude (x1), latitude (x2), and distance from the Pacific coast (x3) for 30 meteorological stations scattered throughout California are saved in the CALIRAIN file. (Selected observations are listed in the table above.) Consider the first-order model ,y = ?0 + ?1×1 + ?2×2 + ?3×3 + ?.,a. Fit the model to the data and give the least squares prediction equation. ,b. Is there evidence that the model is useful in predicting annual precipitation y? Test, using ? = .05. ,c. Find a 95% prediction interval for y for the Giant Forest meteorological station (station 9). Interpret the interval.

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