Question

7. (4pt) A term used to describe the case when the independent variables in a multiple regression model are correlated is a. regression b. correlation c. multicollinearity d. None of the above answers is correct 8. (4pt) A variable that cannot be measured in numerical terms is called a. a nonmeasurable random variable b. a constant variable c. a dependent variable d. a categorical variable 9. The following regression model has been proposed to predict sales at a computer store. û = 60 - 2X1 + 30X2 + 10X3 Where X1 = competitor's previous day's sales in $1,000s) X2 =population within 1 mile (in 1,000s) X3 = 1 if radio advertising was used: 0 if otherwise û = Sales (in $1,000s) a) (4pts) What is the estimated regression equation if no radio advertising was used? b) (4pts) What is the estimated regression equation if radio advertising was used? c) (4pts) What is the expected amount of sales attributable to radio advertising?

Answer 1

7)

Answer:

Given that:

A term used to describe the case when the independent variables in multiple regression model are correlated is

(c) multicollinearity

when there is a correlation between independent variable or explanatory variable exit then a problem of multicollinearity arises

MORE EXplnation

Corrrelation is a linear relaationship between two variable X,Y

and Regression means when we have single dependent variable and a number of explanatoty variable are regressed on dependent variable are positively correlated then Corressponding oifficient are negatively correlated

Option (c) is correct answer

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