$($b$)$ The following table summarizes the strain rate data taken from pure lead samples which were subjected to different stress and temperature conditions. Equations:

${}_{ss}=A{}^n$exp$(-\frac{Q}{R}T)$

Where:

${}_{ss}$ is the steady state rate constant,

$T$ is the absolute temperature,

$A$ is the pre$-$exponential factor,

$$ is stress,

n is the stress exponent,

$Q$ is the molar activation energy for creep,

$R$ is the universal gas constant $=8\mathrm{.}314J$ mol. ${?}^{-1}{K}^{-1}.$

Creep data for pure lead.

Determine the value of n for this material.

This formula is also given $\backslash$epsi $\_$ss $=$ A $*\backslash$sigma $^$n $*$ exp$(-$Q $/($R $*$ T$))$

Where:

$\backslash$epsi $\_$ss is the steady state rate constant,

T is the absolute temperature,

A is the pre$-$exponential factor,

$\backslash$sigma is stress,

n is the stress exponent,

Q is the molar activation energy for creep,

R is the universal gas constant $=8\mathrm{.}314$ J mol$$ K$.$

$($side question$)$What values do we use for A and Q$,$ and also do we need to include all samples when finding v or can we just use the first $4$ where tempertaure is constant? I read online to just use the samples where the temperture is constant but then why would the examiner even add the extra samples with different tempertures?