=+45. Cereal shelf placement. Supermarkets often place similar types of cereal on the same supermarket shelf. The shelf placement for 77 cereals was recorded as well their sugar content. Does sugar content vary by shelf? Here’s a boxplot and an ANOVA table.

15 10 5

0 1 2 3 Shelf Sugars (g)

Source DF Sum of Squares Mean Square F-ratio P-value Shelf 2 248.4079 124.204 7.3345 0.0012 Error 74 1253.1246 16.934 Total 76 1501.5325 Level n Mean StdDev 1 20 4.80000 4.57223 2 21 9.61905 4.12888 3 36 6.52778 3.83582