13 Questions 13 to 16 are based on the following information: The scatter diagram below illustrates the relation between the points scored (x) and the points conceded (y) by UP-Tuks in 5 randomly selected Varsity Cup rugby games. Note that the values in the diagram are labelled as (x, y). Scatter diagram for the number of points scored and conceded in 5 games 20 (16, 18) (24, 16) Points conceded (v) 10 (23, 12) (44, 5) 5 (52, 0) 0 0 5 10 15 20 25 30 35 40 45 50 55 60 Points scored (x) Question 13 (1) The range of x is: (A) 108 (B) 60 (C) 52 (D) 36 E 18 Question 14 (2) The coefficient of variation for y is: (A) 48.33% ) 74.15% (C 76.78% (D) 134.87% E 560.78% STK110 EXAM / EKSAMEN 2013-06-10 O15 Question 15 (1) The scatter diagram indicates that: (A) a perfect linear relationship exists between x and y (B) a positive linear relationship exists between x and y C) a negative linear relationship exists between x and y (D) a nonlinear relationship exists between x and y (E) no linear relationship exists between x and y Question 16 (2) Given s =-113.45, what is the value of the sample correlation coefficient? )-1.0246 (B) -1.2200 (C) -0.9526 (D) -0.9760 (E) -0.0084 Questions 17 and 18 are based on the following information: Suppose f(x) = - for x = 1, 2 a discrete random variable. 3x Question 17 (1) f(x) is a valid probability function for x, since: (A) Osf (x) $ 1 for x = 1, 2 and Ef(x) 21 B -Is f (x)