A manufacturer of cereal is considering three alternative box colors—red, yellow, and blue. To check whether such a consideration has any effect on sales, 16 stores of approximately equal size are chosen. Red boxes are sent to 6 of these stores, yellow boxes to 5 others, and blue boxes to the remaining 5. After a few days a check is made on the number of sales in each store. The results (in tens of boxes) shown in the following table were obtained.

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Red 43 52 59 76 61 81 Yellow 52 37 38 64 74 Blue 61 29 38 53 79