Which one of the following statements is true about the dispersion of the distribution of sample means?
1) The dispersion of the distribution of sample means is always greater than the dispersion of the population.
2) The dispersion of the distribution of sample means is always smaller than the dispersion of the population.
3) The dispersion of the distribution of sample means is equal to the dispersion of the population.
4) The dispersion of the distribution of sample means is unrelated to the dispersion of the population.