When comparing the three simulated sampling distributions that they constructed, the teachers correctly were able to describe that, as the sample size increases, the variability of the simulated SDMs decreases and the shape becomes more approximately normal. However, when discussing the mean of the SDM, none of the teachers gave the description that we were expecting. Instead, most observed that the mean of the SDM tends to get closer to the mean of the population as the sample size increases. For example, the means of one teacher’s three simulated sampling distributions are shown in Table 1. As the sample size increases, the means do, in fact, get closer to the population mean of 27,394. So the teacher wrote about the pattern in the three means of the SDMs,