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8.63. For random samples from an innite population, what happens to the standard error of the mean if the sample size is (a) increased from

8.63. For random samples from an innite population, what happens to the standard error of the mean if the sample size is (a) increased from 30 to 120; (b) increased from 80 to 180; (c) decreased from 450 to 50; ((1) decreased from 250 to 40

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