Winter road treatments to clear snow and ice can lead to cracking in the pavement. An experimentwas conducted comparing four treatments:

Winter road treatments to clear snow and ice can lead to cracking in the

pavement. An experimentwas conducted comparing four treatments: sodium

chloride, calcium chloride, a proprietary organic compound, and sand. Traffic

level was used as a blocking factor and a randomized complete block experiment

was conducted. One observation is missing, because the spreader

in that district was not operating properly. The response is new cracks per

mile of treated roadway.

Our interest is in the following comparisons: chemical versus physical

(A,B,C versus D), inorganic versus organic (A,B versus C), and sodium versus

calcium (A versus B). Which of these comparisons seem large?