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.
Sarcasm is verbal irony, so it is not surprising that people confuse them frequently. Sarcasm is verbal; intonation and non-verbal expression help carry the meaning, and as such, it does not convey well on the Internet and other socially blind media (excepting of course, streaming video, etc).