The marketing department for an upscale retail catalog company wants to determine if there are differences in the mean customer purchase amounts across the available purchase sources (Internet, phone, or mail-in). Accordingly, samples were taken for 20 random orders for each purchase source. The following Excel output was compiled.

a. At the 5% significance level, can we conclude that the mean purchase amount is different across the three purchase sources?
b. If significant differences exist, use Fisher's LSD method at the 5% significance level to determine which purchase sources have different mean purchase amounts.

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Phone Purchase Mail-in Purchase Internet Purchase x,-$214.05 m = 20 = 212.45 = 20 182.40 m= 20