to illustrate process for using TI83/84 calculator when finding least-squares regression lines (lines of best fit).
The data here pairs number of credits with amount spent on textbooks. Linear regression line is calculated.
Use the TI83/84 to find the least squares regression line - also called the line of best fit. The process is called linear regression. Access the STAT key and use the CALC menu to find option 4:LinReg(ax+b).
After entering data into lists, use the STATPLOT function to create a scatter plot.
Use the VARS button.