Given the data shown in Figure 1, suppose we wanted to estimate a score for someone who had spent exactly 2.3 hours on an essay. I’m sure most of us have experience in drawing lines of best fit, where ...

The 'line of best fit' is a line that goes roughly through the middle of all the scatter points on a graph. The closer the points are to the line of best fit the stronger the correlation is.

There are three ways a line and a circle can be associated, ie the line cuts the circle at two distinct points, the line is a tangent to the circle or the line misses the circle. To work out which ...