The app does what it is suppose to. Works ok on iPad. However, the publisher needs to fix the value entry aspect on the iPhone as you cannot see anything past about eight entries. It will also ask you to "delete a row" but has no explanation on how to do this (can't delete what you can't scroll down to see). Row deletion seems to be a common problem no matter if it is on the iPad or the iPhone. A fix for this would be warranted.
Okay, I never write reviews but this app I think has changed my life and the fact that it is free makes it 100 times better. I doesn't just do standard deviation but so much more! I would recommend this to anyone with a lot of math that they don't want to do by hand
Every time I go back to edit or delete a number/item the app closes forcing me to start over. Very inconvenient. If it that didn't happen I'd give the app 5 stars.
Use this app to calculate the standard deviation of a set of values. It will also return the: -mean(average) -variance -population deviation -Median -Q1 & Q3 To add a value to the set press "+Row". When all data are in press "Calculate". Note: Population deviation (n-1) is unbiased, while normal standard deviation (n) is biased. To calulate the z-score enter a number into the z-score tab, then click find z-score. The z-score will be based off the main table.
