In the colorimetric analysis of chloride ion in aqueous solution, the following data were obtained using the modified Iwasaki method (wavelength = 465 nm): By the mercuric chloranilate method...

In the colorimetric analysis of chloride ion in aqueous solution, the following data were obtained using the modified Iwasaki method (wavelength = 465 nm):

By the mercuric chloranilate method (wavelength = 485 nm):

(a) Show statistically that the procedures yield different results.

(b) When downgraded for the inconsistency of the results in the pairs of trials, the students who obtained these data said that the results of these trials were obtained with reagents prepared from two different water sources: trial l using laboratory distilled water and trial 2 using commercial distilled water. They contended that the difference in water sources is the major source of error. Perform suitable calculations to make a definite comment on their contention.