The store manager of one university bookstore has tested two types of point-of-purchase displays for its new erasable pen. A shelf display was placed in a random sample of 20 stalls, and a floor display was placed in 15 other stalls in the area. The mean number of pens sold per stall in one month was 45 at 0.10 significance level, was there a significant difference between sales with the two types of displays if the standard deviation in general recorded to be 7.

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