Depending on the data that has been obtained, there are mathematical techniques that can be used to further analyse the results. From a straight-line graph the gradient can be calculated.

In this example, even if the true value lies at ... It is difficult to draw a conclusion about a real difference if the range of results is wide.

David G. Brown is an award-winning artist, who’s editorial cartoons have been featured in the [L.A.] Sentinel for the last 20 ...