Buyers from online mega retailer Amazon.com use a star rating to rate products and sellers. You plan to use simple linear regression to link average star rating (x) to average daily sales (y) for Amazon sellers of consumer electronics who have at least 1000 ratings. The following data are available:

Show the data in a scatter diagram and use the least squares criterion to find the slope (b) and the intercept (a) for the best fitting line. Sketch the least squares line in your scatter diagram. Use the line to predict average daily Amazon sales for sellers with a star rating of 2.2.

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Star Rating ales in $000s 2.0 3.5 2.5 4.0 24 32 40 48