Consumer Reports Health (www.consumer reports.org) gave the accompanying data on saturated fat (in grams), sodium (in mg), and calories for 36 fast-food items.
Fat Sodium Calories
2 1042 268
5 921 303
3 250 260
2 770 660
1 635 180
6 440 290
4.5 490 290
5 1160 360
3.5 970 300
1 1120 315
2 350 160
3 450 200
a. Construct a scatterplot using y = sodium and x = fat. Does there appear to be a relationship be- tween fat and sodium?
b. Add a vertical line at x = 3 and a horizontal line at y = 900 to the scatterplot in Part (c). This divides the scatterplot into four regions, with some of the points in the scatterplot falling into each of the four regions. Which of the four regions corresponds to healthier fast-food choices? Explain.