Johny has a sample of n1=8, with the sample mean X1=45, and a sample standard deviation of S1=7, and you have an independent sample of n2=16 from another population with a sample mean of X2=30, and the sample standard deviation S2=5. what is a 90% confidence interval estimate of the population mean difference between 1 and 2. the two population variances are equal.

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12

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( to two decimal places asneeded.)