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.