Acompany that relies on Internetbased advertising linked to key age demographics wants to understand the relationship between the amount it spends on this advertising and units sold. Complete parts a through c below. a) Which variable is the explanatory or predictor variable? . Since the company wants to predict units from advertising expenditure, the explanatory variable is units. . Since the company wants to predict advertising expenditure from units, the explanatory variable is units. . Since the company wants to predict advertising expenditure from units, the explanatory variable is advertising expenditure. . Since the company wants to predict units from advertising expenditure, the explanatory variable is advertising expenditure. b) Which variable is the response variable? . Since the company wants to predict advertising expenditure from units, the response variable is advertising expenditure. . Since the company wants to predict advertising expenditure from units, the response variable is units. . Since the company wants to predict units from advertising expenditure, the response variable is advertising expenditure. . Since the company wants to predict units from advertising expenditure, the response variable is units. c) Which variable would you plot on the x-axis? . Since units is the explanatory variable, it should be plotted on the xaxis. . Since advertising expenditure is the explanatory variable, it should be plotted on the x-axis. . Since advertising expenditure is the response variable, it should be plotted on the x-axis. . Since units is the response variable, it should be plotted on the x-axis