5958
The test of significant toxicity ( TST ) analysis is a two - sample comparison test that uses Welch ' s t test to compare organism responses in a sample ( effluent or surface water ) with responses in a control or site sample .
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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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