Hi dear friends,

please help me with answering this Problem:

We used two methods to determine nitrate concentration in water, 3 repetition of measurements have been done in each method. Do the means in two methods differ significantly?

method A: 10, 10, 11 ppm

method B: 11, 11, 10 ppm

Degree of freedom (95%): 1 2 3 4 5 6

t: 12.7 4.30 3.18 2.78 2.57 2.45

Reference: Statistical Data Treatment and Evaluation, SKOOG