2. Marketing Data Set contains the impact of three advertising medias (youtube, facebook and newspaper) on sales. Data are the advertising budget in thousands of dollars along with the sales. The advertising experiment has been repeated 200 times. (a) Use the marketing data to predict sales based on each of the advertising budget invested in youtube, facebook and newspaper by fitting a simple linear regression model. Verify whether the condition for fitting a regression model is met. (b) Use multiple regression model to predict sales based on the advertising budget invested in youtube, facebook and newspaper. What is your best model? Justify your answer.

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