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Part $1$

The following multiple regression model was developed to predict job performance as measured by a company job performance evaluation index based on a preemployment test score and college grade point average$($GPA$)$:

ModifyingAbove y with caretyequals$=4040$plus$+1717$x $1$x$1$plus$+4747$x $2$x$2,$

where

ModifyingAbove y with caretyequals$=$

job performance evaluation$$ index,

x $1$x$1$equals$=$

preemployment test$$ score,

x $2$x$2$equals$=$

college GPA.