A study compares the effect of four 1-month point-of-purchase promotions on sales. The unit sales for five stores using all four promotions in different months
follow
Free sample 78 87 81 89 85
One-pack gift 9491 87 90 88 73 78 69 83 76
Cents off
Refund by mall
7983 78 69 81
() compare the mean unit sales for each promotion and then determine the
mean.
grand
(10) Estimate the population variance using the between column variance. (W) Estimate the population variance using the with-in column variance computed
from the variance within samples.
(W) Calculate the F ratio. At the 0.01 level of significance, do the promotions
produce different effects on sales? (June 2011)
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