8.90 Independent random samples of n = 50 and n = 60 observations were selected from populations 1 and 2, respectively. The sample sizes and computed sample statistics are given in the table: 

Find a 90% confidence interval for the difference in population means and interpret the interval.

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Sample size Sample mean Sample standard deviation Population 1 2 50 60 100.4 96.2 0.8 1.3