Question 130993
A new model of digital camera is marketed in three major department store chains. THe number of cameras sold every month at each three store chains is listed below:
Target - 177, 200, 191, 188
KMart - 164, 144, 170, 151
WalMart - 180, 213, 198, 204
At 0.05 level of significance is there a difference in the mean numbers of cameras sold at the three stores?
a. state null and alternative hypothesis
Ho: the means are the same
Ha: at least one of the means is different
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b. compute 
SS total = Summation(x-xbarbar)^2= 3767.16667
SST = Summation n(subi)(x-bar-xbarbar)^2 
SSE = Summation(ni-1)(si)^2
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c. Develop ANOVA table
For each data element the expected value is (row total/grand total)*(columun total)
d. what is the decision regarding the null hypothesis, is there a difference in the mean numbers od cameras sold at the three stores?
Test statistic: F = 13.2907
p-value = 0.002058...
Conclusion: Reject Ho: at least one of the means is different.
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Cheers,
Stan H.