1. If I want to know which way is faster, why isn’t it good enough to just drive one way one day?
1. If I want to know which way is faster, why isn’t it good enough to just drive one way one day, the other way the next, and then simply see which way was faster?
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The sample size is too small. Random and uncontrollable variations may skew the results. So, a path which is the fastest one day may be the slowest on another day.