Hi All - I am trying to calculate and plot the St Dev on a metric as the sample size grows. The attached Excel sheet shows a sample data set with 20 tests and the associated speed result. After 2 tests, I can calculate the St Dev of those 2, add the 3rd test and St Dev changes, all the way to the last test.
I cannot for the life of me figure out how to do this in Tableau! Please help!
Please attach you twbx workbook so we can see how far you got and where things went wrong