Statistics
Standard deviation, probability, sample size, and z-score calculators.
Showing 9 tools
Statistics
Confidence Interval Calculator
Calculate the confidence interval for a population mean given sample mean, standard deviation, sample size, and confidence level.
Mean, Median, Mode, Range Calculator
Calculate the mean (average), median (middle value), mode (most frequent), and range for a data set.
Number Sequence Calculator
Calculate the nth term and sum of arithmetic (add constant) or geometric (multiply constant) sequences.
Permutation and Combination Calculator
Calculate permutations P(n,r) and combinations C(n,r) — the number of ways to arrange or select r items from n.
Probability Calculator
Calculate the probability of an event, its complement, and combined probabilities for multiple events.
Sample Size Calculator
Determine the required sample size for a survey or study based on population size, confidence level, and margin of error.
Standard Deviation Calculator
Calculate population and sample standard deviation, variance, and mean for a set of numbers.
Statistics Calculator
Compute comprehensive descriptive statistics including mean, median, standard deviation, quartiles, and IQR.
Z-Score Calculator
Calculate the z-score (standard score) and approximate percentile for a value relative to a normal distribution.