The scatterplot above shows the number of male and female students at Central High School from 1990 to 1999. In which one of the years shown was the absolute value of the difference between the numbers of male and female students greatest?
The difference will be greatest for points where the x and y values are far apart. So look for points at the extreme top or right hand corner of the graph-- say (200,0) or (0,200) as opposed to ones where they’re both in the 100-200 range.