5964
The authors demonstrate that ( 1 ) moderately unequal variances ( similar to WET data ) have little effect on coverage of the t test or Welch t test ( for normally distributed data ) , and ( 2 ) for nonnormally distributed data ( similar in distribution to WET data ) TST , using Welch ' s t test , has close to nominal coverage on the basis of simulations with up to a ninefold difference in variance between the effluent and control groups ( ~ 95th percentile based on observed WET test data ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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