PCB in Fish.In the PCB in fish example, we learned that lake trout switch diet when they are about 60 cm long. Large trout (> 60 cm) tend to have higherPCB concentrations. Assuming that PCB...

PCB in Fish.In the PCB in fish example, we learned that lake trout switch diet when they are about 60 cm long. Large trout (> 60 cm) tend to have higherPCB concentrations. Assuming that PCB concentration distribution canbe approximated by the log-normal distribution,

(a)
use a statistical test to compare the mean concentrations of large and small trout

(b)
discuss any potential problems of using this test based on relevant graphic methods.