A control chart consists of several parts. It has two control limits and an average line. The bottom dashed line is called ...

Andrews' Pitchfork is a chart analysis tool used to determine the trend price range. The tool consists of a median line, ...

value the upper ... graph and arrive at 38 and 47. You are allowed to be out by a little but be as accurate as you can. So the interquartile range is the difference between the upper quartile and ...