And in this case, your sensor isn't giving a wildly wrong answer like 5 m/s^2, but rather something close to the correct answer, like 9.15 m/s^2. It's easy to

And in this case, your sensor isn't giving a wildly wrong answer like 5 m/s^2, but rather something close to the correct answer, like 9.15 m/s^2. It's easy to think up ways that your sensor could be 5-10% off. It's very difficult to come up with an entirely new theory of gravity that explains everything we observe about the world, but also makes gravity a few percent weaker in this one case.