Sales of People magazine are compared over a 5-week period ...

     Sales of People magazine are compared over a 5-week period at four Borders   outlets in Chicago.   Does   the data prove a significant difference in mean weekly sales? Magazines     Store   1 Store 2 Store 3 Store 4          102   97 89 100           106   77 91 116           105   82 75 87           115   80 106 102           112   101 94 100