In what way did soviet rule fail to live up to communist theory?

In the communist theory,  The country that implemented the communist system , will free all its people from poverty since the country could easily controlled everything. But during the era of Soviet's rule, a large number of its people living below the poverty line, which make the soviet union fail to live up to communist theory

A:The median attention span of college students is greater than the median attention span of high school students.

C:The interquartile range of attention spans of college students is greater than the interquartile range of attention spans of high school students.