The average American drinks approximately 50 gallons of soda (pop) a year, delivering approximately 50,000 calories and no nutrition. Some legislators are recommending instituting a sales tax on soda to raise revenue and fight obesity. Will a sales tax impact consumption? Suppose that a sales tax on soda will be added in a random sample of communities to measure the impact on soda consumption. We wish to determine whether average per-capita consumption of taxed soda is significantly less than 50 gallons a year. Figure B.8 shows dotplots of three pairs of possible sample results. In each case, indicate whether the results of Sample A or Sample B show stronger evidence that average consumption of taxed soda is below 50, or state that neither sample shows evidence that the mean is below 50. Explain your reasoning in each case.

Figure B.8

a.

b.

c.

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Sample A Sample Bliij 36 39 42 45 48 51 54 Gallons of soda per year