The sample standard deviation of sodium concentration in eels blood (mEq/L) for m = 20 marine eels was found to be s1=40.5 whereas the sample standard deviation of concentration for n = 20 freshwater eels was s2=32.5. Assuming normality of the two concentration distributions, test at level .10 to see whether the data suggests any difference between concentration variances for the two types of eels.