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Exploring the Data<br />
Graphing Data<br />
3 In Graph variables, enter Days.<br />
4 Click Multiple Graphs, then<br />
click the By Variables tab.<br />
5 In By variables with groups in separate<br />
panels, enter Center.<br />
6 Click OK in each dialog box.<br />
Graph<br />
window<br />
output<br />
Interpret<br />
results<br />
The delivery times for each center are approximately normally distributed as shown<br />
by the distribution curves exhibiting the same pattern.<br />
If you have fewer than 50 observations, you may want to use a normal probability plot (Graph<br />
➤ Probability Plot or Stat ➤ Basic Statistics ➤ Normality Test) to assess normality.<br />
<strong>Meet</strong> MINITAB 2-7
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