A new model ofdigital camera is marketed in three major department storechains.

Question

   A new model ofdigital camera is marketed in three major department storechains. The number of cameras sold every month at each ofthree store chains is listed below.  

Target

K Mart

Wal Mart

177

164

180

200

144

213

191

170

198

188

151

204

At 0.05 level of significance,is there a difference in the mean numbers of cameras sold at thethree department store chains?

a. Statethe null and the alternative hypothesis.

b. ComputeSS total, SST, and SSE.

c. Developan ANOVA table

d. What isthe decision regarding the null hypothesis (is there a differencein the mean numbers of cameras sold at the three department storechains)?

Target

K Mart

Wal Mart

177

164

180

200

144

213

191

170

198

188

151

204

Explanation / Answer

Source DF    SS   MS      F     P
Stores   2 3767 1884 13.29 0.002
Error    9 1276   142
Total   11 5043

S = 11.90   R-Sq= 74.71%   R-Sq(adj) = 69.08%

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