Question: Mama's Pizza restaurant chain would like to understand which variable most strongly influences the amount of sales of their specialty, deep-dish pizza. They have gathered

Mama's Pizza restaurant chain would like to understand which variable most strongly influences the amount of sales of their specialty, deep-dish pizza. They have gathered data on the number of monthly sales (in 100's) of deep-dish pizzas and the amount spent per month on advertising at 15 of their restaurants. Below are the results of the linear regression to predict the number of monthly sales (in 100's) based on monthly advertising (in $1,000's).

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