The Following Regression Model Has Been Proposed to Predict Sales $\hat { Y }$

Short Answer

The following regression model has been proposed to predict sales at a computer store.
$\hat { Y }$ = 50 - 3X1 + 20X2 + 10X3
where
X1 = competitor's previous days sales in $1,000s) X2 = population within 1 mile in 1,000s)
X3 =
= sales in $1,000s)
$\hat { Y }$ Predict sales in dollars) for a store with the competitor's previous day's sale of $5,000, a population of 20,000 within 1 mile, and nine radio advertisements.