Repeat the computations carried out in Exercise 3.3, using
now the cubic interpolating spline computed by the function spline. Then
compare the results obtained with those obtained by solving Exercise 3.3.
The following data are related to the life expectation of
citizens of two European regions:
Use the interpolating polynomial of degree 3 to estimate the
life expectation in 1977, 1983 and 1988.
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