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measurement error
Measurement error is error caused by the natural fluctuation in most real-world measurements.
unstandardized slope
Unstandardized slope measures steepness of the best-fitting line; because It will depend on the units of measurement of the variables included, it must be interpreted in context.
bimodal distribution
Bimodal distribution has two clear clumps of scores around two parts of the measurement scale, with few in the middle.
values
Values are the number or category that represents an individual case's measurement on that variable (e.g., 65 represents an individual student's thumb length in mm).
standard deviation
Standard deviation the square root of the variance; we generally prefer thinking about error in terms of standard deviation because it yields a number that makes sense using the original scale of measurement.