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min w 1 ( δ ) = { 0 , when w 1 = 0 or 1 , if ( μ d i f f μ 0 ) 0 1 2 N 1 2 ( μ d i f f μ 0 ) σ , when w 1 = 1 2 , if ( μ d i f f μ 0 ) < 0 max w 1 ( δ ) = { 0 , when w 1 = 0 or 1 , if ( μ d i f f μ 0 ) < 0 1 2 N 1 2 ( μ d i f f μ 0 ) σ , when w 1 = 1 2 , if ( μ d i f f μ 0 ) 0

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\begin{align*} \min _{w_1} (\delta ) & = \left\{ \begin{array}{ll} 0, & \mbox{when} \quad w_1 = 0 \quad \mbox{or} \quad 1, \quad \mbox{if} \quad (\mu _\mr {diff} - \mu _0) \ge 0 \\ \frac{1}{2}N^\frac {1}{2} \frac{(\mu _\mr {diff} - \mu _0)}{\sigma }, & \mbox{when} \quad w_1 = \frac{1}{2}, \quad \mbox{if} \quad (\mu _\mr {diff} - \mu _0) < 0 \\ \end{array} \right. \\ \max _{w_1} (\delta ) & = \left\{ \begin{array}{ll} 0, & \mbox{when} \quad w_1 = 0 \quad \mbox{or} \quad 1, \quad \mbox{if} \quad (\mu _\mr {diff} - \mu _0) < 0 \\ \frac{1}{2}N^\frac {1}{2} \frac{(\mu _\mr {diff} - \mu _0)}{\sigma }, & \mbox{when} \quad w_1 = \frac{1}{2}, \quad \mbox{if} \quad (\mu _\mr {diff} - \mu _0) \ge 0 \\ \end{array} \right. \\ \end{align*}