On does not exist but what you are missing is why are those Chinese Americans not all that much taller. You still can look at that data and go the law of averages only 3 inches shorter. I hope you dont forget the numbers that sit on both sides of that average. Many people on one might not even be shorter they could be taller that is the laws of averages. However, do you deny the possibility of an outlier? In addition 3 inches is VERY large number think of Usian Bolt with all his gifts would you know his name if he was 3 inches shorter????? Maybe not. Think about what that total difference in does over the course of 100 meters? Two strides to three strides? The difference between being the fastest man ever and someone nobody ever heard of. Now as for your focus being on the issue of height. Do you deny there is a difference or in this example? My school is the most deverse school in the St. Louis Metro area. I can tell you this difference does not just lie with her and her parents. However, it is an extreme difference and it is why it has been presented to make a strong point in addition to get people talking. Do you deny all the other differences or other points of the blog?
To have an outlier you first have to have a population measured under the same set of conditions. You cannot draw scientific, or even psuedo-scientific conclusions from a single example. She is not an outlier from a population, she is the single population point of your one person qualitative observation. It is an anecdotal example. That statement is not meant to be critical, it is simply the truth.
One could say its because she ate cheetos or drank Tang and have just as much scientific credibility. To look at one girl who may or may not be above average height and draw conclusions that some genetic change has taken place is a stretch to be generous. Your reference to variation and standard deviation would more than explain her, even if she is above average. How tall is this girl anyway? Again, the average height for a Chinese national female is 5’2″, more or less. Is she 6’2″? How tall are her parents?