已知命题\(p:∃x∈R,2{x}^{2}+\left(m-1\right)x+ \dfrac{1}{2}\leqslant 0 \),命题\(q:\)“曲线\(C: \dfrac{{x}^{2}}{{m}^{2}}+ \dfrac{{y}^{2}}{2m+8}=1 \)表示焦点在\(x\)轴上的椭圆”,命题\(s\)“曲线\(C: \dfrac{{x}^{2}}{m-t}+ \dfrac{{y}^{2}}{m-t-1}=1 \)表示双曲线”
\((1)\)若“\(p∧q \)”是真命题,求\(m\)的取值范围;
\((2)\)若\(q\)是\(s\)的必要不充分条件,求\(t\)的取值范围.