In probability theory, the sample space of an experiment or random trial is the set of all possible outcomes or results of that experiment. A sample space is usually denoted using set notation, and the possible ordered outcomes are listed as elements in the set. It is common to refer to a sample space by the labels "S", , or "U" (for "universal set").
probability theory is a theory on experiments.
A: Yes

The Dow Jones Industrial Average closed at its lowest level in over six years on Thursday, having lost 1.16%, or 89.68 points, bringing it to a level of 7,465.95. It had, at one point, set an intraday bear market low of 7,447.55. It was the lowest ending for the index since October 9, 2002. The Dow has fallen almost fifteen percent since the start of this year.
The Dow Jones average had changed since 2002.
A: Yes

Fleas<br>My dog has fleas and constantly scratching himself. I took my dog to the veterinarian office. The veterinarian gave my dog two shots. Eventually the fleas started to die. My dog finally stop scratching himself.
The veterinarian gave the dog three shots.
A:
No