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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Chi-Square Test Calculator
Perform a chi-square goodness-of-fit test comparing observed vs expected frequencies.
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T-Test Calculator
Perform a one-sample t-test comparing a sample mean to a population mean.
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One-Way ANOVA Calculator
Compare means of 3 groups using one-way analysis of variance (ANOVA).
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Linear Regression Calculator
Compute slope, intercept, R-squared, and predictions from paired x,y data.
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Binomial Distribution Calculator
Calculate P(X=k) and cumulative probabilities for a binomial distribution.
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Normal Distribution Calculator
Calculate z-score, probability, and percentile for a normal distribution.
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Poisson Distribution Calculator
Calculate P(X=k) and cumulative probabilities for a Poisson distribution.
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IQR Calculator
Calculate the interquartile range (IQR) from a data set of up to 10 values.
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Percentile Calculator
Find the percentile rank of a value in a data set.
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Hypothesis Testing Calculator
Perform a z-test for hypothesis testing with a decision at your chosen significance level.
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Bayes Theorem Calculator
Calculate P(A|B) using Bayes theorem from P(B|A), P(A), and P(B).
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Expected Value Calculator
Calculate the expected value from outcomes and their probabilities.
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Outlier Calculator
Detect outliers in a data set using the IQR method.
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Box Plot Calculator
Calculate box plot statistics: min, Q1, median, Q3, and max from a data set.
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Histogram Calculator
Generate frequency distribution from data with configurable number of bins.
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