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In a one-sided upper tail hypothesis test for the mean difference, for a random sample of size 15 the t-score of the sample mean difference is 2.515. Is this significant at the 5% level? At the 1% level? Significant at the 1% level, but not at the 5% level. Significant at the 5% level, but not at the 1% level. Significant at both the 1% and 5% ... ................
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