Answer:
a double blind research study
Step-by-step explanation:
Double-blind study: In psychological research, the term "double-blind research study" is described as one of the research studies whereby neither the experimenter nor the participants or subjects know about the specific treatment being received by the participants.
A "double-blind research method" is being utilized to avoid or ignore bias in the results because of the placebo effect or demand characteristics.
In the question above, Scarlett is recording data for a "double-blind research study".