· ess Count Mean Std Dev Std Error t Statistic P-VaIue 20 2.15 1.182 0.264 »=2.5 2.5 19 - 1.29...

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Transcript of  · ess Count Mean Std Dev Std Error t Statistic P-VaIue 20 2.15 1.182 0.264 »=2.5 2.5 19 - 1.29...