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An independent-measures study with n = 8 in each treatment produces M = 75 for the...

An independent-measures study with n = 8 in each treatment produces M = 75 for the first treatment and M = 71 for the second treatment with a pooled variance of 9. Construct a 95% confidence interval for the population mean difference.

Can you please show the work thoroughly, I have the answer, which is 0.7825<x<7.2175, I just need help in how to get to the answer. Thank you!

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