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 basically the art of using a humorous insult to humble or rebuke someone. It isn't easy to do it right. A lot of people claim to hate sarcasm, but even they will still admire someone who does it well, with good taste and wit. That is, we often notice it only when it somehow goes wrong.