![]() If you didn’t name your variables in Step 1, the variable names will be listed as column identifiers (C1, C2 etc.). Step 4: Choose a variable name and then click “Select” to move the variable name to the Graph Variables box. This is the option you’re likely to use 99% of the time in elementary statistics. ![]() Step 3: Click the “Single” probability plot image. Step 2: Click “Graph” on the toolbar and then click “Probability plot.” Give your variables meaningful names in the first (blank) row (this makes it easier to build the plot when you select a variable name in Step 4). Step 1: Type your data into columns in a Minitab worksheet. That’s why technology like Minitab or SPSS is a good idea to make these types of graphs. Normal probability plots aren’t normally drawn by hand, because the normal scores used for the plot can’t be looked up in a table.
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