There are four McBurger restaurants in the Columbus, Georgia, area. The numbers of burgers sold at the respective restaurants for each of the last 6 weeks are shown below. At the .05 significance level, is there a difference in the mean number sold among the four restaurants when the factor of week is considered?

a. Is there a difference in the treatment means?
b. Is there a difference in the blockmeans?

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Restaurant Metro 124 234 430 105 240 310 University 320 340 290 River 190 230 240 170 180 205 Week Interstate 220 245 260 280 270