Normal Distribution Calculator
https://surfstat.anu.edu.au/surfstat-home/tables/normal.php
Quadratic Formula Calculator
https://www.mathpapa.com/quadratic-formula/
Online Integral Calculator
https://www.integral-calculator.com/
Online Derivative Calculator
https://www.derivative-calculator.net/
Table: Chi-Square Probabilities
https://people.richland.edu/james/lecture/m170/tbl-chi.html
t-distribution quantiles
http://user.keio.ac.jp/~clinet/teaching/tquantiles.pdf
t Table
http://www.sjsu.edu/faculty/gerstman/StatPrimer/t-table.pdf
t test Calculator
https://stattrek.com/online-calculator/t-distribution.aspx
chi-square-calculator
https://www.mathsisfun.com/data/chi-square-calculator.html
Upper Tail probability of Chi Square Distribution(The Best)
https://shiny.rit.albany.edu/stat/chisq/
Solving Simple Equations
https://www.mathpapa.com/equation-solver/
Draw a Function(2D or 3D)
If an equation can not be solved by the online solver tools, you can draw it in some software, one software is call Grapher shipped by MacOS.
Gamma Distribution
https://keisan.casio.com/exec/system/1180573217
Draw a Function
- Grapher by Apple Inc
- G Search Box
graphing-calculator
https://pt.symbolab.com/graphing-calculator
for example, input this: x^2+y^2-xy=1