1. The marketing manager of a large supermarket chain would like to determine the effect of shelf space on the sales of pet food. A random sample of 10 stores was selected and the results are presented below: Store Shelf Space (in feet) Weekly Sales ( thousands) 5 16 5 22 3 8 14 4 8 19 10 24 10 26 14 23 8 14 27 19 28 10 19 26 a. Draw the scatter diagram. b. Draw a trend line and use it to estimate the weekly sales when the shelf space is 20 feet. c. Determine the least square regression equation. d. Using the least square regression equation, compute the weekly sales when the shelf space is 20 feet. Compare it to your answer in letter b. e. Predict the weekly sales when the shelf space is 21.5 feet and 25 feet