=+46. Cereal shelf placement, part 2. We also have data on the protein content on the 77 cereals in Exercise 45. Does protein content vary by shelf? Here’s a boxplot and an ANOVA table.

6 5

4 3

2 1

Protein (g)

1 2 3 Shelf Source DF Sum of Squares Mean Square F-ratio P-value Shelf 2 12.4258 6.2129 5.8445 0.0044 Error 74 78.6650 1.0630 Total 76 91.0909 Level n Mean StdDev 1 20 2.65000 1.46089 2 21 1.90476 0.99523 3 36 2.86111 0.72320