# 18: Confidence Interval Calculator for a Mean With Statistics (Sigma Unknown)


CONFIDENCE INTERVAL Calculator WITH STATISTICS

Fill in the sample size (n), the sample mean ($$\bar{x}$$), the sample standard deviation (s), and the confidence level (CL).  Write the confidence level as a decimal.  For example, for a 95% confidence level, enter 0.95  for CL.  Then hit Calculate and assuming the population is normally distributed, the confidence interval will be calculated for you.

 $$\sigma$$ Unknown $$\sigma$$ Known

n:   $$\bar{x}$$:   CL:
 Lower Bound Upper Bound