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Industrial Statistics with Minitab by Xavier Tort-Martorell Llabres, Lluis Marco Almagro, Pere Grima Cintas

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23.2 Exploratory Analysis

To start, the best strategy consists in taking a look at the data and a good way to do this is through: Graph > Matrix Plot: Simple

nc23uf001.eps
nc23uf002.eps

In the previous plot, observe that there is only one car with five cylinders. Use the option Brush (see Chapter 4) to identify that this point belongs to a Volvo 850 GLT.

Also, it seems that the relationship between power and maximum speed is not linear but quadratic. We will try to confirm this impression by analyzing the corresponding residuals.

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