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Statistics Calculator
Mean, median, mode, standard deviation, and more
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About Statistics Calculator
Calculate comprehensive statistics from a dataset: mean, median, mode, range, variance, standard deviation, quartiles, IQR, and outlier detection.
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Tips
- Mean is sensitive to outliers; median is more robust for skewed data
- Use sample std dev (n-1) for samples, population std dev (n) for complete datasets
- IQR-based outlier detection flags values beyond 1.5×IQR from quartiles
Frequently Asked Questions
What is the difference between population and sample variance?
Population variance divides by N (total count), sample variance divides by N-1 (Bessel's correction) to give an unbiased estimate when working with a subset of data.
How are quartiles calculated?
Q1 is the median of the lower half, Q2 is the overall median, Q3 is the median of the upper half. IQR = Q3 - Q1.