NUTR 45300 Lecture Notes - Lecture 4: Binomial Test, Null Hypothesis
29 Aug 2016
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Directed tests: participants know what to look for. Can set up triangle or tetrad like this but requires extra instruction. Triangle: two samples are the same one is sweeter than the other. Tetrad: two of the samples have less sweetness and two samples have greater sweetness. Non-directed test: participants do not know what to look for. Paired comparison, triangle as shown, tetrad as shown. Do not mix difference testing with preference testing ever. Participants will be biased against the odd man out sample. Statistical tables: they will tell you how to analyze difference or preference data. Yes or no; wrong or right; control or test sample. Code data as 0 or 1 and use a statistical table to determine whether people could tell a difference/had a preference. Line scales: use this form of measurement for intensity. Line scales are better than categories even if those categories are labeled with numbers. Or it can have a participant rank multiple samples.
