The weighted average of the variances $S _ { 1 } ^ { 2 } \text { and } S _ { 2 } ^ { 2 }$ of two independent samples is referred to as the __________ of $\sigma ^ { 2 }$ (the common variance of the two population variances), and is denoted by __________.

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The Answer of The weighted average of the variances $S _ { 1 } ^ { 2 } \text { and } S _ { 2 } ^ { 2 }$ of two independent samples is referred to as the __________ of $\sigma ^ { 2 }$ (the common variance of the two population variances), and is denoted by __________.

The Weighted Average of the Variances S12 and S22S _ { 1 } ^ { 2 } \text { and } S _ { 2 } ^ { 2 }S12​ and S22​

The Weighted Average of the Variances $S _ { 1 } ^ { 2 } \text { and } S _ { 2 } ^ { 2 }$