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Chapter 4: Analysis of Variance Applied Statistics SEMESTER II, 2015/2016 20. The removal of ammoniacal nitrogen is an important aspect of treatment of leachate at landfill sites. The rate of ammoniacal nitrogen removal (in percent per day) is recorded for several treatment methods. The result of analysis of variance using Microsoft Excel is presented in the table. Source of Variation SS df MS F P-value F crit Between Groups 19.0086 4 4.7522 2.3604 0.1172 3.3567 Within Groups 22.1465 11 2.0133 Total 41.1551 15 a. Determine the sample size involved in this study. b. Can you conclude that the treatment methods differ in their rates of removal? SEMESTER I, 2016/2017