A consumer investigator obtained prices from mail-order companies and computer stores. The accompanying lists show the prices (in dollars) quoted for cartons of floppy disks from various manufacturers. Use the Wilcoxon rank-sum test to test the claim that there is no difference between mail order and store prices.

Use a 0.05 significance level with the indicated test. If no particular test is specified, use the appropriate nonparametric test from this chapter.

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Mail Order 23.00 26.00 27.99 31.50 32.75 27.00 27.98 24.50 24.75 28.1529.99 29.99 Computer Store 30.99 33.98 37.75 38.99 35.79 33.99 34.79 32.99 29.99 33.00 32.00