Does impulse buying really increase sales? A market researcher is curious to find out whether the location of packages of chewing gum in a grocery store really has anything to do with volume of gum sales. As a test, gum is moved to a different location in the store every Monday for four weeks (four locations). To control the experiment for type of gum, six different brands are moved around. Sales representatives keep track of how many packs of each type of gum are sold every Monday for the four weeks. The results follow. Test to determine whether there are any differences in the volume of gum sold at the various locations. Let a = .05.

Location 1 2 3 4 A 176 58 111 120 B 156 62 98 117 C 203 89 117 105 Brand D 183 73 118 113 E 147 46 101 114 F 190 83 113 115