Statistical calculators for data analysis, probability, hypothesis testing, and more
Calculate p-value from z-score using standard normal distribution.
Calculate confidence interval for a population mean given sample statistics.
Calculate the F-statistic for one-way analysis of variance (ANOVA). Compare means across three groups.
Calculate binomial probabilities P(X=k), cumulative probabilities, mean, variance, and standard deviation for binomial distributions.
Calculate quartiles (Q1, Q2, Q3), IQR, and range for a dataset. Generate five-number summary for box plot visualization.
Calculate the chi-square (χ²) statistic for goodness of fit. Compares observed vs expected frequencies.
Calculate Pearson correlation coefficient (r) between two variables. Measures linear relationship strength and direction.
Calculate sample covariance between two variables. Measures how two variables change together.
Calculate Cohen's d effect size for two independent groups. Measures the standardized difference between means.
Calculate PDF and CDF values for the normal distribution. Enter a value, mean, and standard deviation to find probabilities.
Calculate the minimum sample size needed for a survey or experiment using Cochran's formula.
Calculate the t-statistic for a one-sample t-test. Compares sample mean to population mean using sample standard deviation.