what?

I'm reading a bunch of papers we've been assigned for stats class (because, believe it or not, they're slightly more entertaining than the papers we're supposed to read for the bird & mammal class) and I had to read this a few times to make sure it said what I think it said:

Nondemonic intrusion is defined as the impingement of chance events on an experiment in progress.

Nondemonic? I'd hate to see what demonic intrusion involves.