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Say you suspect (based on prior evidence and inspecting boxplots/histograms) that a difference should be statistically...

Say you suspect (based on prior evidence and inspecting boxplots/histograms) that a difference should be statistically significant but upon performing a Mann-Whitney test, you get a p-value of 0.11 (and your alpha is 0.05). What could be a possible reason for your result?

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