The application for the inferential statistics can easily π for a parameter that determines a parameter μ with known or unknown σ and for the corresponding mean differences and confidence intervals are performed hypothesis tests (z-test, t-test).

confidence interval - Example:
with a sample (n = 16, mean 19, σ = 5, confidence level 0, 95) can an interval estimation be performed. After entering the initial values​​, the result can be output graphically or numerically.

Hypothesis test - Example:
With a sample (n = 16, average 19, σ = 5, null hypothesis μ