29 Dec g the display in four different
g the display in four different locations in various stores; at the entrance, in the snack section, by the cash register, and with the soft drinks.
Each display location was utilized in three stores over a one-week test period. Because the 12 stores which
used to test the display dier somewhat in overall sales volume, they were divided into three categories.
Within each category, the assignment of stores to display method was random. Units sold are shown in the
following table:
Unit Sales, by Location Display
Store
Sales Volume
Entrance Snacks Register Drinks
Below Average 46 38 57 54
Average 62 50 67 67
Above Average 75 62 89 77
Is it possible to be 99% certain that the display locations’ mean sales are not equal? Conduct the appropriate
follow-up analysis (use = 0:01) to establish which means are signicantly dierent. List all necessary
assumptions and indicate which might be suspect. Also perform a non-parametric analysis.
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