Your hamster is 3.42 inches long. And, certainly, with a population of 300,000,000 people, a 400 or even 900 vote difference is simply not sufficient to be resolved by the testing methodology. And in addition to the precision with which the test is taken is the issue of noise. No matter how fine-tuned a system is, any system does, indeed, have noise. Radios have static.
Hearts have murmurs.
The notion of a perfectly healthy heart is just a fantasy. The electricity in your house fluctuates with dips and spikes. This could be an entire series of books, and indeed the books have been written, about all we have learned of the scientific method, and getting a reading from the instruments that is sufficiently above the floor noise to be statistically significant. And no, I am not being silly. I am trying to make an important point here.