Question: Question 1 Calculate the 90% confidence interval for the difference (mu1-mu2) of two population means given the following sampling results. Population 1: sample size =12,

Question 1 Calculate the 90% confidence interval for the difference (mu1-mu2) of two population means given the following sampling results. Population 1: sample size =12, sample mean =27.55, sample standard deviation = 3.18. Population 2: sample size =21, sample mean =12.88, sample standard deviation = 0.71 . Your answer: 12.18

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