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Construct a 90% confidence interval estimate for the difference between two population means given the following...

Construct a 90% confidence interval estimate for the difference between two population means given the following sample data selected from two normally distributed populations with equal variances:

   Sample   1    Sample 2

29          25        31          42           39           38

    35        35        37 42           40           43

    21         29        34    46           39           35

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