Question

select the correct answer from each drop-down menu.

a scientist conducted an experiment to measure the effect of apple cider vinegar on blood sugar levels. the scientist randomly selected 200 adults and randomly assigned them to two subject groups. the first subject group received an apple cider vinegar supplement, and the second subject group received a placebo. the scientist was aware of which subjects were assigned to each group.

this experiment is choose an answer because choose an answer know which treatment group each subject is in.

dropdown 1 options:

• double-blinded
• blinded
• not blinded

Explanation:

Identify the blinding status of the experiment

The text states: "The scientist was aware of which subjects were assigned to each group." Since the researcher knows the assignments, the experiment cannot be double-blinded. Furthermore, there is no mention that the subjects themselves were unaware (though they received a placebo, the question focuses on the scientist's awareness to determine the overall classification). Since the researcher knows, the experiment is "not blinded" (or at least not double-blinded, and specifically "not blinded" fits the context of the dropdown options where the reason is about who knows).

Determine the reason for the classification

The sentence structure is: "This experiment is [not blinded] because [only the subjects do not] know which treatment group each subject is in." Or, looking at standard experimental design definitions: if the subjects do not know but the researcher does, it is single-blinded ("blinded"). However, if the dropdown options for the second blank are about who knows, "only the subjects do not" or "the subjects do not, but the researcher does" fits. Let's analyze the exact phrasing: "This experiment is [blinded] because [only the subjects do not] know..." or "This experiment is [not blinded] because [both the subjects and the researcher] know..."
Since a placebo was used, the subjects do not know which group they are in (they are blinded). Since the scientist does know, only one party is blinded. Therefore, the experiment is "blinded" (specifically single-blinded, often just referred to as "blinded") because "only the subjects do not" know which treatment group each subject is in.

Match options to the blanks

• First blank options: "double-blinded", "blinded", "not blinded".
• Since the subjects receive a placebo and are unaware, but the scientist is aware, it is a single-blind experiment. Thus, the first blank is "blinded".
• Second blank completes: "...because [only the subjects do not] know which treatment group each subject is in" (or "the subjects do not" depending on the exact dropdown text, which typically reads "only the subjects do not" or "the subjects do not").

Answer:

Select the correct answer from each drop-down menu.

A scientist conducted an experiment to measure the effect of apple cider vinegar on blood sugar levels. The scientist randomly selected 200 adults and randomly assigned them to two subject groups. The first subject group received an apple cider vinegar supplement, and the second subject group received a placebo. The scientist was aware of which subjects were assigned to each group.

This experiment is <blank>blinded</blank> because <blank>only the subjects do not</blank> know which treatment group each subject is in.