Hey there. My name is Zach Bobbitt. I have a Masters of Science degree in Applied Statistics and I’ve worked on machine learning algorithms for professional businesses in both healthcare and retail. I’m passionate about statistics, machine learning, and data visualization and I created Statology to be a resource for both students and teachers alike. My goal with this site is to help you learn statistics through using simple terms, plenty of real-world examples, and helpful illustrations.

2 Replies to “Confidence Interval Calculator”

This site looks great – thanks for all the hard work!

If I wanted to use this to find the confidence interval for an intervention, would I be using a value of n which looks at the entire sample (ie control and treatment branches) or just the treatment one?

This site looks great – thanks for all the hard work!

If I wanted to use this to find the confidence interval for an intervention, would I be using a value of n which looks at the entire sample (ie control and treatment branches) or just the treatment one?

Sorry for the noob question!

This calculator is not correct — it is using the “sample” std deviation as the **population** std deviation.