Examlex
What happened when researchers added BPDE,a component of tobacco smoke,to human lung cells in a laboratory experiment?
Observational Study
A study where the researcher observes and records data without influencing the outcomes.
Self-Administered Survey
A data collection method where respondents fill out the questionnaire on their own, without the direct assistance of a researcher.
Demographic Variables
Characteristics of populations used in social science research, such as age, gender, income level, marital status, ethnicity, and education level.
Packaging Preference
Consumer's or user's favoritism towards the design, material, and functionality of packaging for products.
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