Finding the Equation of a Sine Curve Using Biorhythm Graphs

Objectives: 

• Estimate the equations of your personalized biorhythm graphs by using the standard sine equation,  y = d + asin[b(x-c)]. 
• Use the sine regression function on the Ti-83, TI-84 or TI-84 Plus graphing calculator to find the equations of your graphs. 
• Predict your biorhythms for the day of the final exam using both sets of equations, then calculate the percent error for each graph between your two equations.