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The sample standard deviation for the Di = 1 group is s1 = $6, 000 and the sample size for this group is n1 =

The sample standard deviation for the Di = 1 group is s1 = $6, 000 and the sample size for this group is n1 = 1000. The sample standard deviation for the Di = 0 group is s1 = $4, 000 and the sample size for this group is n1 = 4000. Is the difference in means statistically significant at the 5% level? Show your work

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