A sample containing years to maturity and yield (%) for 40 corporate bonds is contained in the data file named CorporateBonds.

(a)

Develop an estimated regression equation with x = years to maturity and

x² as the independent variables. (Round your numerical values to two decimal places.)

=

(b) As an alternative to fitting a second-order model, fit a model using the natural logarithm of years to maturity as the independent variable; that is,

= b₀ + b₁ ln(x). (Round your numerical values to two decimal places.)

=