Say I devised a test of the smoothness of steel ball bearings. Maybe it'd be something like rolling the bearing around on a soft substrate and then checking the

Say I devised a test of the smoothness of steel ball bearings. Maybe it'd be something like rolling the bearing around on a soft substrate and then checking the substrate for scratches. That test would be precise (I'd know the maximum bound on the size of imperfections in the bearing) but not accurate (it wouldn't tell me anything about the absolute radius of the bearing or the location of the imperfections). The point is, with the information given, we haven't been told anything about the accuracy of the test. Maybe it is. Maybe it isn't. That's just blank information. We've only been told the precision.