Three entrepreneurial women open a shop selling high-quality second-hand children's clothing, toys, and furniture. Items are consigned to the shop by individuals who then receive a percentage of the selling price of their items. Daily data for April 2004 was recorded, including each day's gross sales, broken down by the method of payment (cash or credit card). 'Gross sales' in retailing are overall dollar sales, not adjusted for returns or discounts. The data record the number of items sold and the dollar amount of gross sales for each payment method on the day. The three owners are interested in the relationship between the amount and the number of items sold for cash purchases.
The scatterplot of the data, together with the equation of a fitted regression line, is shown below.
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