Mr. Castillo is the owner of a small bakery in a large town. He believes that the smell of fresh baking will encourage customers to purchase goods from his bakery. To investigate his belief, he records the daily sales for 10 days when all the bakery's windows are open, and the daily sales for another 10 days when all the windows are closed. The following sales in pesos are recorded: Windows Open Windows Closed 2020 1935 2156 2006 2045 1922 2088 1818 2070 1994 1878 1692 2155 1776 2041 1772 1908 2054

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