  The formal degree conjecture and the root number conjecture are verified with
respect to supercuspidal representations of $Sp_{2n}(F)$ and $L$-parameters
associated with tamely ramified extension $K/F$ of degree $2n$. The
supercuspidal representation is constructed as a compact induction from an
irreducible unitary representation of the hyper special compact group
$Sp_{2n}(O_F)$, which is explicitly constructed, based upon the general theory
developed by the author, by $K$ and certain character $\theta$ of the
multiplicative group $K^{\times}$. $L$-parameter is constructed by the data
$\{K,\theta\}$ by means of the local Langlands correspondence of tori and
Langlands-Schelstad procedure.
