QUESTION 10 Consider the following simple linear regression model between the dependent variable, SALES (reflecting monthly sales, in dollars) and independent variable, ADVERTISING (representing the monthly advertising expenditure, in dollars): Expected(SALES) = 3800 + 1.5 ADVERTISING. The value 1.5 in the above regression model represents: The expected sales with no advertising The expected increase in sales for each additional dollar of advertising The ratio of Sales over advertising The proportion of variation in sales explained by advertising