Multiple samples of students were asked four questions , with the sampling variablility of their answers to question 3 being the
highest . Question 2 had the second highest sampling variability, question 1 came next , and finally question 4 had the lowest sampling variability, the answers to which of the questions are most reliable?
(1, -3) can be removed so that the resulting graph represents a function. A relation from a set X to a set Y is called a function if each element of X is related to exactly one element in Y
