Perform Box and Whisker Plot analysis to determine variation and central tendency of data due to time, parts, and production tools.
The box represents the distance between the 1st and 3rd quartiles. The whiskers show the highest and lowest data points or 1.5 times the box (Q3-Q1). Outlier points are those that are greater than 1.5 times (Q3 -Q1).
The QI Macros SPC Software can create a box whisker plot in Excel for you.