Two brand managers were in disagreement over the issue of whether urban homemakers had greater variability in grocery shopping patterns than did rural homemakers. To test their confl icting ideas, they took random samples of 70 homemakers from urban areas and 60 homemakers from rural areas. They found that the variance in days squared between shopping visits for urban homemakers was 14 and the sample variance for the rural homemakers was 3.5. Is the difference between the variances in days between shopping visits signifi cant at the 0.01 level?
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