I believe the answer is: double-blind experiment
In double blind experiments, the subjects that receive the treatment is remained unknown by both the researchers and the subjects until the experiment is finished. The main purpose of double-blind experiment it eliminate the bias of perception that might exist among researchers.
Explanation:
probably in jamestown ???
<span>the fact that nearly everyone in Europe was Christian
</span><span>https://quizlet.com/9251340/world-history-lecture-4-flash-cards/
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The answer is letter A. An important key to a good observational records is the use of language. The most known type of observational records that uses the language is narrative recording which focuses all behaviors during the time of recording or observing.
