Ethical Food Choice Motives. In the paper “Measurement of Ethical Food Choice Motives” (Appetite, Vol. 34, pp. 55–59), research psychologists M. Lindeman and M. Va¨an¨ anen of the ¨ University of Helsinki published a study on the factors that most influence peoples’ choice of food. One of the questions asked of the participants was how important, on a scale of 1 to 4 (1 = not at all important, 4 = very important), is ecological welfare in food choice motive, where ecological welfare includes animal welfare and environmental protection. Following are the responses of a random sample of 18 Helsinkians.
322333223 331342131 At the 5% significance level, do the data provide sufficient evidence to conclude that, on average, Helsinkians respond with an ecological welfare food choice motive greater than 2?

a. Use the Wilcoxon signed-rank test.

b. Use the t-test.

c. Compare the results of the two tests.