> Your trial sounds expensive, maybe 50 times as expensive as the version where you just talk to people, for the same statistical power. It is, especially if y

> Your trial sounds expensive, maybe 50 times as expensive as the version where you just talk to people, for the same statistical power. It is, especially if you do it with proper statistical power. Though I'm deeply convinced that it would do science a lot of good to do fewer more expensive, but meaningful trials instead of more meaningless ones. Your concern is somewhat valid, as you can't "blind" the test, but by using similarly priced bikes you could at least cancel out a price bias. Still there might be a "new tech" bias towards e-bikes. But then we're at "this is the best we can do" and there are limitations of how good we can study things. The study quoted above is not even near trying to do that.