Consider the following data where X represents advertisement money spent and Y represents sales revenue generated.

x ('000$) : 45, 35, 25, 55, 65, 45, 25, 65

Y ('000$): 103, 83, 63 ,123 ,153, 93, 73, 133

The regression equation is 25734 + 1,987X, Calculate the standard error of estimate for the data set.