Z-Score Table
Look up standard normal probabilities for any z-score, or find the z-score for a probability.
Get the mean, median, mode, standard deviation, variance, quartiles and range of a data set in one go.
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Population if you measured every member of the group; sample if your data is a subset used to estimate the whole.
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Look up standard normal probabilities for any z-score, or find the z-score for a probability.
Calculate the sample or population standard deviation of a data set, with every step shown.
Find critical t-values for any degrees of freedom and significance level, one- or two-tailed.
Combine the probabilities of two independent events, or find the chance something happens at least once over repeated tries.
Find the mean, median, mode and range of a set of numbers, with the sorted list.
Find the sample or population variance of a list of numbers, with the mean and sum of squares.