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Exercise: Muscle strength, age and height for alcoholic men, 5

Question 5: Plot a histogram and Normal plot for the residuals.

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Suggested answer

We do this via the regression command.

Click __Analyze__, __Regression__, __Linear__.
Select Quadriceps strength into __Dependent__ and Height into __Independent__.
Make sure that __Method__ is __Enter__.
Click __Plots__, click __Histogram__, Click __Normal probablity plot__.
Click __Continue__.
Click __OK__.

You should get the following graphs:

I have improved both of these graphs by increasing the size of text,
deleting things I did not want, etc.

The histogram is roughly symmetrical and the Normal plot is roughly straight,
so the assumption of a Normal distribution appears quite plausible.

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Last updated: 4 December, 2006.

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