A convenience store that also sells gasoline is interested in the following regression of Sales, their daily dollar sales, on Volume, their daily number of gallons of gas sold. 2800 2600 2400 2200 Sales (Dollars) 2000 1800 1600 . I . I . I . I . I . 1500 2000 2500 3000 3500 4000 4500 Volume (Gallons) Parameter Estimates Term Estimate Std Error tRatio Prob>|t| Intercept 1288.43 226.61 5.69 <.0001 volume question before this data was collected the convenience store manager had claimed that average sales is not affected by gallon of gas sold. what does regression tell us about claim>