Question 12AB.

Ah agribusiness performed a regression of wheat yield [bushels per acre) using observations on 29 test plots with four predictors (rainfall, fertilizer, soil acidity, hours of sun]. The standard error was 1.22 bushels. [a] Find the approximate width of a 95% prediction interval for wheat yield. {Round your answer to 2 decimal placesJ a yi : 2.89 0 lb} Find the approximate width using the quick rule. (Round your answer to 2 decimal places.) a yi |+ 239 o