A vending machine company sells its packaged foods in a variety of different machines. The company is considering three types of new vending machines. Management wants to know if the different machines affect sales. These vending machines are designated as J-1000, D-320, and UV-57. Management also wants to know if the position of the machines indoors or outdoors affects sales. Each of six similar locations was randomly assigned a machine and position combination. The data below are the number of purchases over four days.

a. Draw the interaction graph. Based on your observations, is there an interaction effect? Based on the graph, describe the interaction effect of machine and position.
b. Compute an ANOVA with statistical software, and use the 0.05 level to test for position, machine, and interaction effects on sales. Report the statistical results.
c. Compare the inside and outside mean sales for each machine using statistical techniques. What do you conclude?

Transcribed Image Text:

Position/Machine D-320 UV-57 J-1000 33, 40, 30, 31 43, 36, 41, 40 29, 28, 33, 33 48, 45, 40, 44 47, 39, 39, 45 37, 32, 36, 35 Inside Outside