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An agribusiness performed a regression of wheat yield (bushels per acre) using observations on 20 test plots with four predictors (rainfall, fertilizer, soil, acidity, hours

An agribusiness performed a regression of wheat yield (bushels per acre) using observations on 20 test plots with four predictors (rainfall, fertilizer, soil, acidity, hours of sun). The standard error was 1.13 bushels. (a) find the approximate width of a 95% prediction interval for wheat yield. yi + _. (b) find the approximate width using the quick rule. yi + _.

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