If two randoom samples of sizes n1 30 and n2 36 are, Ask an Expert

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If two randoom samples of sizes n1 = 30 and n2 = 36 are selected independently from two populations with mean 78 and 85, and with standard deviations 12 and 15, respectively, then the standard error of the difference between Xbar1 and Xbar2 are equal to??

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