Basics of Statistics & Graphs

Basics of Statistics teaches basic statistics for beginners, step by step: 28 short lessons in 6 sections, with 35 original drawings, 43 worked examples and 86 practice questions.
Start with data, graphs and descriptive statistics (mean, median, mode, quartiles, standard deviation), then take your first steps in probability, the normal curve and regression. Works offline.

Each lesson explains the idea in plain language first, then shows the picture and the formula. Every term is defined when it first appears, and the worked examples use small numbers you can check yourself.

What you will learn

• Data and Sampling: what statistics is, populations and samples, types of data, sampling methods, bias in surveys and samples, experiments and observational studies
• Graphs of Data: frequency tables and bar charts, histograms, stem-and-leaf and dot plots, cumulative frequency and ogives, and the shape of a distribution (symmetric, skewed)
• Centre and Spread: mean, median and mode; range, quartiles and IQR; box plots and outliers; variance and standard deviation; z-scores and percentiles; the empirical rule and Chebyshev
• Probability: sample spaces and events, probability rules, conditional probability and independence, Bayes' theorem with tree diagrams, permutations and combinations
• Continuous Distributions: density curves, the normal distribution, the standard normal and the z-table, and the normal approximation to the binomial
• Correlation and Regression: scatterplots and correlation, the least-squares line, residuals and r²

Features
• 28 lessons in 6 sections, from the first definitions to the normal distribution and regression
• 35 original drawings: histograms, box plots, ogives, dot plots, tree diagrams, normal curves, scatterplots and regression lines
• 43 worked examples with every step shown
• 86 practice questions with tap-to-reveal answers
• Search all lessons from the home screen
• Dark mode
• Works offline, no account needed
• Available in 8 languages: English, Español, Português, Français, Deutsch, العربية, हिन्दी and Bahasa Indonesia

Who it is for
• Beginners who want basic statistics explained simply, with no prior knowledge needed
• High school students meeting descriptive statistics, graphs of data and probability for the first time; useful when revising the descriptive statistics and probability parts of AP Statistics
• College students in a first statistics course who want a short, clear review of the basics
• Anyone who reads charts, averages and surveys at work or in the news and wants to understand them

Basics of Statistics is an independent study aid. Content is based on the OpenStax Introductory Statistics 2e and OpenIntro Statistics (4th edition) textbooks and the NIST/SEMATECH e-Handbook of Statistical Methods. It is not affiliated with any exam board, textbook publisher, university or official body.

Recent changes:
Completely rewritten: a beginner's course in statistics — data and sampling, graphs, mean, median and standard deviation, box plots, basic probability, the normal distribution, and correlation and regression — with drawings, worked examples and practice questions. Now in 8 languages: English, Spanish, Portuguese, French, German, Arabic, Hindi and Indonesian.