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.