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.
Irony is a literary device where the chosen words are intentionally used to indicate a meaning other than the literal one. Irony is often mistaken for sarcasm. Sarcasm is actually a form of verbal irony, but sarcasm is intentionally insulting. When you say, Oh, great after your drink has spilled all over your expensive new clothes, you don't actually mean that the incident is positive.