Which of the following is the equation for the graph shown?
graph of an ellipse on a coordinate plane going through approximately 0 comma 6, 0 comma negative 6, 4 and one half comma 0 and negative 4 and one half comma 0 with points inside ellipse at 0 comma negative 4 and 0 comma 4, and lines y equals 9 and y equals negative 9
x squared over 20 plus y squared over 36 equals 1
x squared over 36 plus y squared over 20 equals 1
x squared over 20 minus y squared over 36 equals 1
x squared over 36 minus y squared over 20 equals 1

Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above