Examlex
Suppose a star produces an ultraviolet photon during the Dark Ages.The photon is emitted from a continuum source with a wavelength between the absorption lines of neutral hydrogen,but it is absorbed as it travels a long distance through the neutral hydrogen.Why?
Degrees of Freedom
The quantity of autonomous numbers or measures that can be allocated to a statistical distribution while still adhering to all restrictions.
Sample Size
The number of observations or elements drawn from a larger population for the purpose of statistical analysis.
Null Hypothesis
A hypothesis that there is no effect or no difference, and it serves as the default assumption in statistical hypothesis testing.
Correlation Coefficient
A statistical index ranging from -1 to 1 that measures the degree of association between two variables.
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