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From 1970 to 1998 the U.S.dollar
Selection Bias
A distortion in the outcome of a study due to non-random selection of participants, leading to an unrepresentative sample.
Double-Masked
A study design in which neither the participants nor the researchers know which participants belong to the control group and which to the experimental group, to prevent bias.
Correlation
A statistical measure that describes the extent to which two variables change together, and the direction (positive or negative) of that relationship.
Magnitude
The size, extent, or importance of something, often quantified in terms of measurements or impact.
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