I believe the answer is: double blind procedures
double blind procedures refers to a form of study in which both participants and the researchers do not know which subjects are receiving the treatment. The purpose of double blind procedures is to prevent the bias held by the experimenters along with placebo effects.
The more reliable measure for comparing changes in the standard of living over a series of years is increase in GDP per capital.
<h3>What is GDP per capita?</h3>
GDP per capita serves as the measures that is been used in economic output of a nation per person.
It helps in the determining the prosperity of a nation as regards the economic growth per person in that nation, hence, The more reliable measure for comparing changes in the standard of living over a series of years is increase in GDP per capital.
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Answer:
b
Explanation:
because Greenland is much bigger
