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For the following two samples, calculate the corresponding z-score to test whether the two means are the same: 1. Sample 'I, E(x'|):20.5, 31:7, n1:120 2.

For the following two samples, calculate the corresponding z-score to test whether the two means are the same: 1. Sample 'I, E(x'|):20.5, 31:7, n1:120 2. Sample 2: E(x2)=18.3, 52:11, n2=100 The 2-scores is

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