The following statements create a box chart with schematic box-and-whisker plots in which the observations outside the fences are labeled: proc shewhart data=times limits=timelim ; boxchart delay * ...

You can draw connecting lines between adjacent box-and-whisker plots using the BOXCONNECT=keyword option. For example, BOXCONNECT=MEAN connects the points representing the means of adjacent groups.

The interquartile range is another measure of spread, except that it has the added advantage of not being affected by large outlying values. In order to calculate this value we must first ...

Sampling data - Intermediate & Higher tier - WJEC Cumulative frequency – Intermediate & Higher tier - WJEC Averages and range - WJEC Discussing results - WJEC Mean, median and mode ...