Refer to the table of nicotine amounts. Is each x value matched with a corresponding y value, as in Table 1-1 on page 5? That is, is each x value associated with the corresponding y value in some meaningful way? If the x and y values are not matched, does it make sense to use the difference between each x value and the y value that is in the same column?

The x-values are nicotine amounts (in mg) in different 100 mm filtered, non-?light? menthol cigarettes; the y-values are nicotine amounts (in mg) in different king-size nonfiltered, nonmenthol, and non-?light? cigarettes.

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Nicotine Amounts from Menthol and King-Size Cigarettes 0.9 1.0 0.8 0.8 1.1 1.7 1.7 1.1 1.1 1.1