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Complicated and difficult-to-answer questions should be asked at the very beginning of the questionnaire before the respondent becomes fatigued.
Acetic Anhydride
A chemical compound with the formula (CH3CO)2O, used as a reagent in organic synthesis for the acetylation of alcohols or amines.
Time-series Data
Data points collected or recorded at successive times, often with equal intervals between them.
Cross-sectional Data
A type of data collected by observing many subjects at the same point of time or without regard to differences in time.
Synchronous Data
Data that is collected or updated at the same time across the system or in a coordinated manner.
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