Statistics

Compute a confidence interval for a sample mean from sample size, sample mean, standard deviation and confidence level, with margin of error and bounds.

Calculates mean, average, median, mode and range of up to 10 numbers, instantly, with a data chart.

Find the p-value for a z-score in two-tailed or one-tailed tests, with significance verdicts and critical values.

Find the number of permutations (nPr) and combinations (nCr) for any n and r, with total arrangements and a handy outcome chart.

Find P(A and B), P(A or B), complements and the exclusive-or for two independent events, shown as instant percentages.

Find the sample size needed for a survey from confidence level, margin of error and population proportion, or compute the margin of error for a given sample.

Find the mean, population and sample standard deviation, variance, range and median of six values from 0 to 100 in seconds.

Compute sum, mean, median, sample and population standard deviation, variance, min, max and range for up to 12 numeric values.

Compute the z-score of a raw value from a mean and standard deviation, with exact probability below, above and within based on the normal distribution.