Statistics Resources: Calculators and Learning Guides

Choose a calculation

Identify the quantity you want to describe or estimate before choosing a procedure. Work from data summaries to standardized scores and uncertainty, checking the assumptions at each stage.

• Standard Deviation Calculator

  Calculate sample or population standard deviation, variance, mean and standard error with a deviation table.

• Mean, Median and Mode Calculator

  Find the mean, median and all modes of a numeric dataset with sorted data and calculation steps.

• Z-Score Calculator

  Standardize a value using a supplied mean and standard deviation and interpret its distance from the mean.

• Confidence Interval Calculator

  Find a two-sided z confidence interval for a mean when the population standard deviation is known.

Build the reasoning

• Probability Distribution Problems: Step-by-Step Examples

  Solve probability distribution problems with tables, expected value, binomial, Poisson and normal examples, plus common mistakes and teaching prompts.

• Confidence Intervals Explained With Examples

  Learn what a 95% confidence interval means, calculate intervals for a mean and proportion, and avoid the most common interpretation mistakes.

• Standard Deviation Step by Step (With Real Data)

  Calculate standard deviation by hand in six steps with contextual data, and learn exactly when to divide by N or n−1.

• Hypothesis Testing Explained Step by Step

  Follow the five hypothesis-testing steps through two complete numerical examples, from hypotheses and conditions to p-values and conclusions.

Explore other subjects

• Geometry Resources: Calculators and Learning Guides

  Choose a geometric relationship before substituting numbers. Explore calculators and worked learning guides.

• Physics Resources: Calculators and Learning Guides

  Start with a model, choose a positive direction and keep units consistent. Explore calculators and worked learning guides.

Browse all calculators