The Vitamin A levels in livers (µmol/L) between normal rats and radiation exposure rats are shown In the below table. Group Mean (μ) 35 25 Standard deviation (0) 2 3 Sample number (n) 50 40 Normal rats Radiation exposure rats 1) What is the standard error of mean (SEM) for each group? 2) Assume that the central-limit theorem is applicable. What does it mean in this context?

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