Discernible

[hardin47]

The discernible change was reasonably straightforward. Not sure what to do about:

1. Significance level (I kept them all in as-is).
2. the phrase "statistical significance". I think I changed many of them to "statistically discernible" or "statistical discernibility", depending on the phrasing (both are sort of awkward).
3. I changed all the HW problems that are in the ims repo. But I didn't change the base assignments (which, I think, means the HW assignments will get written over the next time the HW repo is compiled). It's pretty easy to do, so I'll make the changes the the HW repo once you look at this and confirm that you want to go forward.

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[mine-cetinkaya-rundel]

A few suggestions, but LGTM!