Examlex
The colored part of the eye is called the _______________.
Observational Study
A research method in which the investigator passively observes and records phenomena without altering the environment or conditions.
Sample Survey
A method of collecting data by selecting a subset of individuals from a population to estimate characteristics of the whole population.
Double-Blind Experiment
An experimental method in which neither the participants nor the experimenters know who is receiving a particular treatment, to prevent bias.
Double Blind
An experimental design where neither the participants nor the experimenters know who is receiving a particular treatment, preventing bias in research results.
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