x1-x2=16. We need a pooled standard deviation. This is sqrt(s1^2/n1+s2^2/n2) That is, sqrt(16^2/6+34^2/11) . This yields 12.156 . The z score for 90% confidence is 1.645. Thus we have 16+/-12.156*1.645= (-4,36).

Apr 27th, 2015

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