Clic Pens has tested two types of point-of-purchase displays for its new erasable pen. A shelf display was placed in a random sample of 40 stores in the test market, and a fl oor display was placed in 40 other stores in the area. The mean number of pens sold per store in one month With the shelf display was 42, and the sample standard deviation was 8. With the fl oor display, the mean number of pens sold per store in the same month was 45, and the sample standard deviation was 7. At α = 0.02, was there a signifi cant difference between sales with the two types of displays?

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