**Objectives:** This tutorial is an introduction to curve fitting, the study
of ways of constructing functions whose graphs are curves that "best"
approximates a given collection of points. We consider approximations by
linear functions, polynomials of degree 2 or 3 and exponential functions using
the method of least squares.
After working through these materials, the student should be able

- to calculate using a graphing calculator or computer software the least squares line, parabola or third degree equation which best fits data.

**Modules:**

**Discussion**[Using Flash]**Examples**.**A Java applet**to calculate the least squares line, parabola or third degree equation which best fits data.

**Using a graphing calculator**to illustrate the method of curve fitting:**Linear Model:**- TI-86 Graphing Calculator [Using Flash]
- TI-85 Graphing Calculator

**Exponential Model:**- TI-86 Graphing Calculator [Using Flash]
- TI-85 Graphing Calculator