premise: If the data from a series of tests performed with the same toxicant , toxicant concentrations , and test species , were analyzed with hypothesis tests , precision could only be assessed by a qualitative comparison of the NOEC-LOEC intervals , with the understanding that maximum precision would be attained if all tests yielded the same NOEC-LOEC interval .
hypothesis: They wanted to make sure they were getting the sane results each time .