When intuition is off slightly.

For most people, gaining weight is caused by eating a bit more calories than they need, repeated day after day. Intuition of how many calories are needed can be close, off by only 50 calories a day, but over time that equates to 5 lbs of weight gained per year. That’s caused by a 2.5% error, the equivalent to a 97.5% score on the test!

There are plenty of problems like this in life. One where intuition gets us close, but data can get us exactly and eliminate the problems that build over time. Know when it’s time to use intuition and when it’s time to use data. One key is if something is going to happen daily, it’s possible data should be used daily to measure it. Think diets, budgets, etc.