To be fair, in the random data, you have people of all actual skill levels estimating their ability at 0.
That's going to skew the data somewhat because people don't work that way. While you will likely have some zeros, I wouldn't expect any from the skilled population and I'd expect fewer from the rest of the population.
That's going to make the "difference in estimation" line higher overall, which would make it intersect higher and more to the right.
That's going to skew the data somewhat because people don't work that way. While you will likely have some zeros, I wouldn't expect any from the skilled population and I'd expect fewer from the rest of the population.
That's going to make the "difference in estimation" line higher overall, which would make it intersect higher and more to the right.