Calculators

For skipping the explanations and calculating straight away.

• Descriptive statistics

  Mean, median, mode, standard deviation, variance, quartiles, coefficient of variation, skewness and kurtosis. Each one step by step.

• Frequency table and histogram

  Simple or grouped frequency table, cumulative and relative frequencies, histogram and frequency polygon.

• Probability, permutations and combinations

  Probability of independent and mutually exclusive events; permutations when order matters, combinations when it does not.

• Binomial and Poisson

  The probability of seeing a given number of successes or events, with a chart and a step-by-step solution.

• Normal distribution and Z score

  The probability of falling below, above or between values; Z and T scores.

• Critical values and p-values

  Rejection regions for the Z, t, χ² and F distributions; is your test statistic significant?

• Statistical tables

  Z (in two formats), t, χ² and F tables with row and column highlighting.

• t test

  One-sample, independent two-sample and paired t tests, with a confidence interval.

• Chi-square test

  Goodness-of-fit test (e.g. a 9:3:3:1 segregation ratio) and test of independence.

• Analysis of variance

  Completely randomized and randomized complete block designs, F test, multiple comparisons with letters, the CV of the trial.

• Factorial and split-plot experiments

  Two-factor experiments: main effects, interaction, interaction plot, two-way means table; two error terms in split-plot designs.

• Correlation and regression

  Correlation coefficient and its significance, regression equation, R² and prediction.