Complete the following steps to specify the data to analyze for your control chart.
- In Variables, enter the column that contains the process data. Each row contains the number of defectives for one subgroup. If you enter more than one column, Minitab creates a separate NP chart for each column.
- In Subgroup sizes, do one of the following:
- If all subgroups are the same size, enter the size (for example, 55).
- Enter a column that contains the size of each subgroup.
In this worksheet, the Rejected Parts column contains the number of defective parts in each subgroup. The Parts Sampled column contains the total number of parts that were sampled for each subgroup.