Here we will implement a Bayesian version of the classical T-test. We will also explore some ways to **summarize the JAGS output**, and we will introduce the concept of **derived quantity**.

We will use the example from **Marc Keryâ€™s Introduction to WinBUGS for Ecologists**, page 92 (Section 7.1 - t-test). The data describe wingspan of male and female Peregrine falcon (*Falco peregrinus*).