Remarks on "Random Sequences"

We consider evidence relevant to whether a (possibly idealized) physical process is producing its output randomly. For definiteness, we’ll consider a coinflipper C which reports “H” for a heads and “T” for a tails. By C producing its output “randomly,” we mean H and T have equal probability and trials are independent. If C produces its output randomly (in the above sense), then we’ll say that C is a random device.