A line of best fit is usually drawn on a scatter diagram. It's drawn so that the points are evenly distributed on either side of the line. There are various methods for drawing this 'precisely ...

To visualize these relationships, you need to choose the right chart type that can effectively ... You can also add a line of best fit or a curve to show the trend or pattern of the data.

A line graph shows how data changes over time. For example, how the volume of traffic changes over a day so you can see the busiest times. A bar chart is best for comparing groups of data.