For random samples from an infinite population, what happens to the standard error of the mean if

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For random samples from an infinite 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;

(d) decreased from 250 to 40?

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