https://www.desmos.com/calculator
Desmos is an amazing real-time graphing utility; as you enter the formula on the left, it is graphed on the right. It’s simple to get started, but you can use it for very sophisticated calculations and statistics.
https://www.nctm.org/Classroom-Resources/Illuminations/Interactives/Line-of-Best-Fit/
National Council of Teachers of Mathematics; there is a huge and wonderful variety of resources here. This particular one allows a student to enter in a table of data, then calculate a line of best fit plus the regression constant “r.” Note, it’s only good for a linear set of data.
Grade 'A' Tutoring 