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The direction in which the trend analysis points.
Errors are normally distributed with mean 0 .
Correlation analysis is the relationship of two values. When two items are similar, they will have a high correlation. Should they differ, they will be much lower in variables.
In statistical analysis, the range is the lowest to highest score. The median is the exact middle, and the mean is the numerical average.
It means half quantitative. So analysis gives approximation, but not exact result.