"When you do these large-scale educational studies, there are ninety-nine uninteresting reasons the study could fail," Duckworth says.
When performing any experiments there are countless variables that can change the outcome. Although some variables can be controlled, a lot of the times experiments are preformed more than once to ensure that the result is exact. Especially because the experiment is a large-scale one there are more chances for failure, although most of these failures will be insignificant they could change the whole experiment.
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