Question: 12. ZIP codes An intern from the marketing department at the Holes R Us online piercing salon has recently finished a study of the companys

12. ZIP codes An intern from the marketing department at the Holes R Us online piercing salon has recently finished a study of the company’s 500 customers. He wanted to know whether people’s ZIP codes vary by the last product they bought. They have 16 different products, and the ANOVA table of ZIP code by product showed the following:
Source DF Sum of Squares Mean Square F-Ratio P-Value Product 15 3.836e10 2.55734e9 4.9422 60.0001 Error 475 2.45787e11 517445573 Total 490 2.84147e11 (Nine customers were not included because of missing ZIP code or product information.)
What criticisms of the analysis might you make? What alternative analysis might you suggest?

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