Question: Using the family lung function data, relate FEV1 to height for the oldest child in three ways: simple linear regression (Problem 7.9), regression of FEV1

Using the family lung function data, relate FEV1 to height for the oldest child in three ways:

simple linear regression (Problem 7.9), regression of FEV1 on height squared, and spline regression (split at HEI = 64). Which method is preferable?

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