The demand for healthy foods that are low in fats and calories has resulted in a large number of "low-fat" and "fat-free" products at the supermarket. The table shows the numbers of calories and the amounts of sodium (in milligrams) per slice for five different brands of fat-free American cheese.

a. Draw a scatterplot to describe the relationship between the amount of sodium and the number of calories.
b. Describe the plot in part a. Do you see any outliers? Do the rest of the points seem to form a pattern?
c. Based only on the relationship between sodium and calories, can you make a clear decision about which of the five brands to buy? Is it reasonable to base your choice on only these two variables? What other variables should you consider?

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Brand Sodium (mg) Calories Kraft Fat Free Singles Ralphs Fat Free Singles Borden Fat Free Healthy Choice Fat Free Smart Beat American 300 300 320 290 180 30 30 30 30 25