Easy Statistics Question. How do I find S if all I have are samples and a confidence interval?

Here is a random sample from normal distribution:





4,6,3,5,9,3





The question asks me to determine a 90% confidence interval. I know from that that the t-score is 2.015. The mean is 5.





In order to do the confidence interval, I have to have s. How do I find s?





Thank you!

Easy Statistics Question. How do I find S if all I have are samples and a confidence interval?
s = sqrt[(1/(n-1)) ∑(x - x*)²]





x is each of your items


n is the number of items


x* is the sample mean





You can do the work, but this is what you should get:


s = 2.28