Answer: This is a "CONTROLLED PLACEBO EXPERIMENT".
Explanation: A controlled placebo experiment is a type of research method that is used to check the effectiveness of a drug in a patient. This is done by selecting a sample group, then randomly divide the two group into a placebo group ( this are the group that will receive the drug treatment ) and the controlled group( these are the group that will receive a coloured mixture that looks like the drug, but does not have any effect). Without the groups knowledge about the real drugs and the coloured mixture, but are followed up and tested.
This is a controlled placebo experiment, because 400 student has been choosed as the sample, and are divided into a placebo group and a controlled group, to check the effectiveness of a drug on their memory.
Answer: guhit
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I think a "representative democracy" is a good description. It's democracy as all the citizens have a say in how their country is governed, and it's a reprepresentative, rather than direct democracy, as they exercise this power through representatives.
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Because it is a big ball of gas and fire which we revolve around for radiation and warmth
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