The Analysis ToolPak, in Google Sheets. Same tools, same output layout as Excel.
If your textbook, course or old workbook says Data → Data Analysis…, this add-on is that menu for Google Sheets. Pick a tool, choose your input range, and the results land in a new sheet or a range you choose, laid out the way the Excel Analysis ToolPak lays them out. It replaces the discontinued XLMiner Analysis ToolPak.
Every result is checked against SciPy and statsmodels.
Free, forever: all 19 classic tools above.
Pro: Logistic Regression and APA-style tables and write-ups. 7-day free trial, then $4.99/month, $19/year or $39 once.
The add-on only reads the cells you select, in the spreadsheet you are working in. All math runs inside Google Sheets. Nothing is uploaded or sent anywhere. Details are in the privacy policy.