How To Find Line Of Best Fit On Ti 84

Introduction

Finding the line of best fit also known as the regression line on a TI-84 graphing calculator is a crucial step in analyzing linear relationships between two variables. Whether you are in high school or college learning how to find the line of best fit on a TI-84 can save you a lot of time ensure accurate results.

Step 1: Enter Data

The first step in finding the line of best fit on a TI-84 is to enter the data into the calculator. You can do this by going into the STAT menu selecting Edit typing in the values for each variable into a list.

For example if you are looking at the relationship between height weight for a group of people you would enter the values for height in one list the values for weight in the other list.

Step 2: Plot the Points

After entering the data you need to plot the points on a scatter plot by going into the STAT PLOT menu selecting the appropriate plot. Make sure that the lists you created in step 1 are selected as the input for the plot.

Step 3: Calculate the Line of Best Fit

Once the points are plotted you can find the line of best fit by using the LinReg feature on the calculator. Go into the STAT menu select CALC choose LinReg(ax+b). Then enter in the lists you created in step 1 for the X Y variables.

The calculator will then give you the equation of the line of best fit in the form y = ax + b where a is the slope of the line b is the y-intercept.

Step 4: Display the Line of Best Fit

To display the line of best fit on the scatter plot go into the STAT PLOT menu select 2nd Y= to add a new equation to the graph. Enter in the equation of the line of best fit that you calculated in step 3.

Conclusion

Finding the line of best fit on a TI-84 can seem daunting at first but following these simple steps can make the process much easier. With a little practice you can quickly accurately identify linear relationships between two variables display them on a scatter plot.