A different study of sales ( y ) with respect to a = advertising expenditure in a given retail business gave the following figures: n = 15, E ¤i = 1,640.35. Σ y = 302.71, Σ 179,858.73, E Ti Yi =...

Extracted text: A different study of sales ( y ) with respect to a = advertising expenditure in a given retail business gave the following figures: n = 15, E ¤i = 1,640.35. Σ y = 302.71, Σ 179,858.73, E Ti Yi = 32,314.28, E v =6,438.91. If the equation of the least squares regression line is y = a + bx, then find the value of a. Give your answer to 3 decimal places.