Probability and Statistics

Probability and Statistics takes you from the rules of probability to statistical inference, with clear explanations, original drawings, worked examples and practice questions.

What's inside
• Probability: sample spaces, addition and multiplication rules, conditional probability, independence, Bayes' theorem with tree diagrams, permutations and combinations
• Discrete distributions: random variables and expected value, binomial, Poisson and geometric distributions
• Continuous distributions: uniform and exponential, the normal distribution, the standard normal and z-scores, the normal approximation
• Sampling distributions: the sampling distribution of the mean, the central limit theorem, sample proportions
• Confidence intervals: z and t intervals for means, intervals for proportions, choosing a sample size
• Hypothesis tests: p-values, type I and II errors and power, z and t tests, tests for proportions, two-sample and paired tests
• Centre and spread: mean, median, quartiles, box plots, standard deviation and z-scores
• Formula sheet and z, t and chi-square tables

Made for studying
• Typeset formulas with every symbol explained
• Worked examples with full steps; all numbers and table values were computed and checked
• Practice questions with tap-to-reveal answers
• Search across all topics
• Dark mode
• Works offline, with no account needed
• Available in 8 languages: English, Español, Português, Français, Deutsch, العربية, हिन्दी and Bahasa Indonesia

For high-school and college students taking a probability or statistics course. This app is an independent study aid.