1. The Best Delivery Corporation has collected the following set of data on Dollars spent on advertisement and the number of units sold in the same period. ESTABLISH a scatter plot. Indicate if there is any correlation. If so add a trend line and get the equation of the line. Is a linear trend line a good fit?

Sales in units

10 280

15 250

5 220

35 400

20 380

25 360

30 320

40 450

50 500

55 700