A company sets different prices for a particular stereo system in eight different regions of the country. The table below shows the numbers of units sold (in 1000s of units) and the corresponding prices (in hundreds of dollars). Sales 420 380 350 400 440 380 450 420 Price 5.5 6.0 6.5 6.0 5.0 6.5 4.5 5.0 (i) In Excel, regress sales on price and obtain the intercept and slope estimates. (ii) Present a plot with the data and the regression line (iii) Based on this analysis, briefly describe your understanding of the relationship between sales and prices