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Independent samples of size 30 and 55 from two normal populations having a common variance 17.6 were found to have means 23.0 and 21.9 respectively.

Independent samples of size 30 and 55 from two normal populations having a common

variance 17.6 were found to have means 23.0 and 21.9 respectively. Find 95% confidence

limits for the difference of population means.

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