Statistics

Standard deviation, probability, confidence intervals

Standard Deviation Calculator

Sample and population standard deviation, variance and mean from a list of numbers.

The probability of an event as favourable outcomes ÷ total outcomes.

Convert odds (for : against) into a probability percentage.

The confidence interval for a mean: mean ± z·(SD/√n).

The sample size needed for a survey at a given confidence and margin of error.

The relative variability of data: standard deviation ÷ mean × 100.

The standard error of the mean: standard deviation ÷ √n.

The probability of exactly k successes in n independent trials.

The percentile of a z-score on the standard normal distribution.

The margin of error for a mean at a chosen confidence level.