1 The appropriate critical value will be selected from the t distribution again depending on the specific alternative hypothesis and the level of significance.  The third factor is the level of significance. The level of significance which is selected in Step 1 (e.g., Î± =0.05) dictates the critical value. For example, in an upper tailed Z test, if Î± =0.05 then the critical value is Z=1.645.
Definition of sarcasm for English Language Learners. : the use of words that mean the opposite of what you really want to say especially in order to insult someone, to show irritation, or to be funny.
In essence, sarcasm is easy (as is most anger, criticism and meanness) while true, harmless wit takes talent. Thus, the main difference between wit and sarcasm is that, as already stated, sarcasm is hostility disguised as humor. It is intended to hurt, and is often bitter and caustic.