There's a plot of conductivity against 1/temperature on question 3, 2004. As you'd expect, it's pretty similar to the plot of carrier concentration against 1/temperature on question 4, 2008.
However, in the intrinsic (low temperature) regime, carrier concentration increases very slowly with temperature but the conductivity decreases. If you keep increasing the temperature, the conductivity continues to decrease and reaches a minimum at the boundary of intrinsic to extrinsic and then it shoots up.
All I can say about mobility is that it's proportional to the mean scattering time, which is expected to decrease with temperature due to thermal motion.
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