An analyst examines the effect that various variables have on crop yield.He estimates the following model: 
,where y is the average yield in bushels per acre,x1 is the amount of summer rainfall,x2 is the average daily use in machine hours of tractors on the farm,and x3 is the amount of fertilizer used per acre.A portion of the regression results is shown in the accompanying table. 
a.Predict the crop yield per acre if x1 is 5,x2 is 4,and x3 is the 0.5.
b.Calculate the standard deviation of the difference between the actual crop yield and the estimate of the crop yield.
c.How much of the variation in crop yield is unexplained by the model?
Definitions:
Major Organic Product
The primary product of an organic reaction that is formed in the greatest yield, determined by the mechanism and conditions of the reaction.
2-Methylheptane
An isomer of octane, a hydrocarbon molecule with a seven-carbon chain and a methyl group attached to the second carbon.
2-Methylhept-1-ene
An organic compound belonging to the class of alkenes, specifically an eight-carbon chain with a double bond at the first position and a methyl group at the second carbon.
Sodium Methoxide
A strong base and nucleophile used in the production of biodiesel, represented chemically as CH3ONa.
Q7: For the exponential model ln(y)= β<sub>0</sub> +
Q11: Consider the partially completed two-way ANOVA (with
Q31: The following are the competing hypotheses and
Q58: Although a polynomial regression model of order
Q60: In the following table,likely voters' preferences of
Q66: One of the assumptions of regression analysis
Q87: In the following table,individuals are cross-classified by
Q88: The serious delinquency rate measures the proportion
Q99: Which of the following is a typical
Q124: If testing the difference between two population