Using probability plots to check the distribution of two sets of data
We will use the probability plot tool to check if data from two suppliers could be normally distributed. The results are stacked in the second column, Length, where the first column, Supplier, informs us which supplier the result comes from. Probability plots from the graph menu allow more options than the normality test in the basic statistics tools. Using the probability plot, we can generate a chart for each supplier.
How to do it…
The following instructions will generate a probability plot for the results of two suppliers:
- Go to the File menu and select Open Worksheet….
- Click on the button labeled Look in Minitab Sample Data folder.
- Open the
Camshaft2.MTWworksheet. - Go to the ...
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