Paired Samples Difference t-Test Calculator
Calculates the t-statistic for a paired t-test from the mean difference, standard deviation of differences, and sample s...
Calculators and explainers tagged under Statistics.
Calculates the t-statistic for a paired t-test from the mean difference, standard deviation of differences, and sample s...
Compute the midrange of a list of numbers — the simple average of the smallest and largest values.
Calculate sample and population standard deviation with variance and z-scores for each value.
Compute the percentile rank of a chosen value within a list of numbers — the percentage of values that fall at or below...
Compute the arithmetic mean (average), median, mode, range, geometric mean, and harmonic mean of a list of numbers.
Calculates the Standard Error of the Mean (SEM) from the sample standard deviation and sample size. Also gives the 95% c...
Estimate the margin of error of a survey result from sample size, observed proportion, and confidence level.
Fit an ordinary least-squares regression line to two equal-length lists of numbers and report slope, intercept, r, and r...
Calculate the coefficient of variation (CV) — a unitless measure of dispersion that lets you compare the spread of data...
Compute the sample covariance, population covariance, Pearson correlation r, and the slope of the regression line from t...
Compute a normal-approximation (Wald) confidence interval for a sample proportion, given the sample proportion p̂, the s...
Computes the Pearson correlation coefficient r from aggregate statistics without raw data: r = [nΣXY − ΣXΣY] / √{[nΣX² −...
Calculates the minimum sample size needed for a survey or proportion estimate at a specified confidence level and margin...
Compute the harmonic mean of a list of positive numbers — useful for averaging rates such as speeds or ratios.
Population and sample variance of a dataset, with the standard deviation shown alongside.
Compute the geometric mean of a list of positive numbers — useful for averaging growth rates and ratios.
Work out how many respondents you need for a given confidence level, margin of error, and population size.
Calculates the coefficient of variation (CV) as a percentage to compare variability between datasets with different mean...
Standard deviation is "average distance from the average". That one sentence covers 90% of everything you ever need to remember about it.