Suggested answer to Exercise: Regression analyses, 2

Question 2: Can we conclude that the mean ear size at birth is 55.9 mm?

Suggested answer

When age is zero, the line would cross the vertical axis at 55.9. This does not mean that babies have ears of this size, because we would be extrapolating beyond the data. We cannot do this because we cannot assume that the straight line relationship will also be valid for children.

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Last updated: 29 July, 2009.

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