A researcher conducted a study comparing the effect of an intervention vs. place

Question

A researcher conducted a study comparing the effect of an intervention vs. placebo on reducing body weight, and found 5 lbs reduction among the intervention group with p- value = 0.01. Another researcher conducted a similar study comparing the effect of the same intervention vs. the same placebo on reducing body weight, and found the same 51bs reduction with the intervention group but could not claim that the intervention was effective because p-value = 0.35. What do you think the 2^nd researcher did differently from the first one?

Explanation / Answer

Since the p-value depends upon the sample size, So the second researcher might have taken small sample size because of which the p-value came higher

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