Statistics Calculators
Standard deviation, probability, z-scores, and data analysis
Standard Deviation Calculator
Calculate population and sample standard deviation from a data set.
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Probability Calculator
Calculate basic probability from favorable outcomes divided by total outcomes.
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Combination Calculator (nCr)
Calculate the number of combinations (nCr) for choosing r items from n.
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Permutation Calculator (nPr)
Calculate the number of permutations (nPr) for arranging r items from n.
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Z-Score Calculator
Calculate the z-score from a value, population mean, and standard deviation.
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Confidence Interval Calculator
Calculate the confidence interval for a population mean.
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P-Value Calculator
Calculate the p-value from a z-score or t-score for hypothesis testing.
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Mean, Median, Mode Calculator
Calculate mean, median, and mode from a dataset of up to 10 values.
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Variance Calculator
Calculate population and sample variance from a data set.
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Margin of Error Calculator
Calculate the margin of error for surveys and polls.
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Sample Size Calculator
Calculate the required sample size for a given confidence level and margin of error.
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Correlation Coefficient Calculator
Calculate the Pearson correlation coefficient (r) from paired data.
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