Trying to cash in on his prizefighting notoriety, Rocky Balboa has opened a fitness gym in downtown Philadelphia. Rocky figured that he could use the extra income. Besides, he was getting tired of prizefighting matches where he got pulverized in the early rounds only to win at the end. At a recent fitness gym owners' convention, he attended several presentations touting the growing popularity of eco-spa fitnessism. Rocky's goal was to make his gym "greener" and thus more attractive to a new class of environmentally conscious members. In particular he has wired the spa's treadmills and stationary bicycles to provide power for its heating and cooling system. He also installed solar panels, wind turbines, and a natural grass putting green on the roof. Unfortunately Rocky has been beaten up so often that he's forgotten everything that he ever knew about statistics. Help him answer the following questions about statistical inference.

(3 pts) Rocky has kept track of the number of female spectators attending his last 23 prizefighting matches. He enters these values into Excel and calculates Descriptive Statistics. He notices that the "standard error" equals 2.19. This value equals (circle one):

S S 2) 3 4 X 5) TT