There are free calculators available on the internet. Here are some sites:
Geogebra Graphing Calculator
Desmos Graphing Calculator
GraphPad Linear Regression Calculator
Mathportal Correlation and Regression Calculator
Meta-Calculator (Graphing, Matrix, Scientific, and Statistics Calculators)
Prefer an app? Check these out:
App from Apple.com Graphing Calculator
App from Google Play Store Graphing Calculator
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