An agribusiness performed a regression of wheat yield (bushels per acre) using o

Question

An agribusiness performed a regression of wheat yield (bushels per acre) using observations on 23 test plots with four predictors (rainfall, fertilizer, soil acidity, hours of sun). The standard error was 1.39 bushels.

Find the approximate width of a 95% prediction interval for wheat yield. (Round your answer to 2 decimal places.)

An agribusiness performed a regression of wheat yield (bushels per acre) using observations on 23 test plots with four predictors (rainfall, fertilizer, soil acidity, hours of sun). The standard error was 1.39 bushels.

Explanation / Answer

here for 21 df , and 95% CI, tvalue =2.0796

and std error for prediction interval =s(1+1/n)1/2 =1.42

hence widht =2*t*std error =5.91

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