13. What is the number of possible permutations of 7 objects taken 3 at a time? (a) 10 (b) 21 (c) 35 (d) 210 14. The difference between permutations and combinations lies in the fact that (a) permutations take order into account, but combinations do not (b) combinations take order into account, but permutations do not (c) combinations involve only continuous variables, but permutations involve discrete variables only (d) permutations involve only continuous variables, but combinations involve discrete variables only 15. The result of an event is called (a) an experiment (b) a trial (c) an outcome (d) a variable 16. Suppose some means is devised that quantitatively describes the political views of people on a continuum from "liberal" to "conservative," where the most "liberal" possible views are represented by a value of 50 (the extreme left end of the scale) and the most "conservative" possible views are represented by a value of 50 (the extreme right end of the scale). Suppose a density function is graphed and it is discovered, not surprisingly, that most people tend to fall near the "middle" and that the curve is bell-shaped. This represents (a) a discrete distribution (b) a normal distribution (c) a uniform distribution (d) none of the above