Which of the Following Represents the Ratio of Variances $\frac { \mu _ { 1 } } { \mu _ { 2 } }$

Multiple Choice

Which of the following represents the ratio of variances?

A) $\frac { \mu _ { 1 } } { \mu _ { 2 } }$
B) $\frac { p _ { 1 } } { p _ { 2 } }$
C) $p _ { 1 } - p _ { 2 }$
D) $\frac { \sigma _ { 1 } ^ { 2 } } { \sigma _ { 2 } ^ { 2 } }$