7. Cheese, again! 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. Do you see any outliers? Do the rest of the points seem to form a pattern?

b. 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 300 30 Ralphs Fat Free Singles 300 30 Borden Fat Free 320 30 Healthy Choice Fat Free 290 30 Smart Beat American 180 25