The first rule of data analysis is to plot your data. Minitab’s Graphical Summary provides both graphical (a histogram with an overlaid normal curve) and numeric summaries of the raw data and key statistics (mean, median, standard deviation, maximum value, minimum value, and sample size).
|When to Use||Purpose|
|Pre-project||Assess your process and verify the process is producing output significantly different from expectations, validating the need for an improvement project.|
|Mid-project||Characterize any input or output.|
|End of project||Verify the process is producing expected output after implementing improvements.|
Single column of continuous data with an optional column of categorical data to be used as a By, or grouping, variable.