If $X _ { 1 } \text { and } X _ { 2 }$ are independent __________ random variables with $v _ { 1 } \text { and } v _ { 2 }$ degrees of freedom respectively, then the random variable $F = \left( X _ { 1 } / v _ { 1 } \right) / \left( X _ { 2 } / v _ { 2 } \right)$ has an F distribution.

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The Answer of If $X _ { 1 } \text { and } X _ { 2 }$ are independent __________ random variables with $v _ { 1 } \text { and } v _ { 2 }$ degrees of freedom respectively, then the random variable $F = \left( X _ { 1 } / v _ { 1 } \right) / \left( X _ { 2 } / v _ { 2 } \right)$ has an F distribution.

If X1 and X2X _ { 1 } \text { and } X _ { 2 }X1​ and X2​

If $X _ { 1 } \text { and } X _ { 2 }$