x = c(7,3,4) y = c(-2,5,-7) z=x y What is zYou have performed a simple linear regression model to understand the effect of online advertisement on sales for a company. The linear regression model shows the coefficient for the Online_Ad (predictor variable) on Sales (response variable) is 15.7 with p-value 0.001. Both Sales and Online_Ad are in $. Sales= 956+15.7* Online_Ad (p-value<0.001) How do you interpret the coefficient 15.7