Resources
Free videos and reading per unit, links checked 2026-10-01. Weak spots are marked.
Unit 0 Arithmetic prerequisites: rounding, E-notation/scientific notation, percents, fractions, complements, divisibility
- Rounding Numbers and Rounding Decimals - The Easy Way!The Organic Chemistry Tutor (YouTube) · video · 12 min
- Scientific Notation - Fast Review!The Organic Chemistry Tutor (YouTube) · video · 12 min
- Percentages Made Easy!The Organic Chemistry Tutor (YouTube) · video · 12 min
Unit 1 Frequency distributions and grouped frequency distributions (classes, range, class width, boundaries)
- Statistics Lecture 2.2: Creating Frequency Distribution and HistogramsProfessor Leonard (YouTube) · video · 1 h 7 min
- How To Make a Histogram Using a Frequency Distribution TableThe Organic Chemistry Tutor (YouTube) · video · 11 min
Unit 2 Histograms, frequency polygons, ogives (cumulative frequency)
- Creating a histogram - Khan AcademyKhan Academy · video · 7 min
- Analyzing a cumulative relative frequency graph - Khan AcademyKhan Academy · video · 6 min
- Statistics Lecture 2.2: Creating Frequency Distribution and Histograms - Professor LeonardProfessor Leonard (YouTube) · video · 1 h 7 min
Unit 3 Pie charts, dot plots, stem-and-leaf plots
- Stem-and-leaf plots (video) | Khan AcademyKhan Academy · video · 6 min
- Frequency tables & dot plots (video) | Khan AcademyKhan Academy · video · 7 min
- Reading pie graphs (circle graphs) (video) | Khan AcademyKhan Academy · video · 3 min
Unit 4 Five-number summary, quartiles (median excluded), box plots, outliers (1.5·IQR)
Weak spot- Identifying outliers with the 1.5xIQR rule (article) | Khan AcademyKhan Academy · article
- How To Make Box and Whisker PlotsThe Organic Chemistry Tutor (YouTube) · video · 14 min
- Creating box plots (practice) | Khan AcademyKhan Academy · exercise
Unit 5 Sample spaces and classical probability (dice, cards, coins, tree diagrams)
Weak spot- Probability using sample spaces (lesson in Unit 7: Probability — videos: All the ways you can flip a coin; Die rolling probability; Subsets of sample spaces + practice exercise)Khan Academy - Statistics and probability, Unit 7: Probability · lesson
- Statistics Lecture 4.2: Introduction to ProbabilityProfessor Leonard (YouTube) · video · 1 h 42 min
- Introduction to Probability, Basic Overview - Sample Space, & Tree DiagramsThe Organic Chemistry Tutor (YouTube) · video · 17 min
Unit 6 Addition rules for probability (mutually exclusive, subtract the overlap)
Weak spot- Addition rule for probability (video) | Khan AcademyKhan Academy · video · 11 min
- Statistics Lecture 4.3: The Addition Rule for ProbabilityProfessor Leonard (YouTube) · video · 1 h 9 min
- Addition rule for probability (basic) (article) | Khan AcademyKhan Academy · article
Unit 7 Multiplication rules, independence, conditional probability, two-way tables
Weak spot- Conditional probability using two-way tables (article) | Khan AcademyKhan Academy · article
- Statistics Lecture 4.4: The Multiplication Rule for "And" Probabilities.Professor Leonard (YouTube) · video · 1 h 6 min
- Conditional Probability With Venn Diagrams & Contingency TablesThe Organic Chemistry Tutor (YouTube) · video · 16 min
Unit 8 Counting rules: fundamental counting principle, factorials
- Factorial and counting seat arrangements (video) | Khan AcademyKhan Academy (Statistics and probability, Unit 8: Counting, permutations, and combinations) · video · 6 min
- Statistics Lecture 4.7: Fundamental Counting Rule, Permutations and CombinationsProfessor Leonard (YouTube) · video · 1 h 37 min
- The Fundamental Counting PrincipleThe Organic Chemistry Tutor (YouTube) · video · 9 min
Unit 9 Permutations and combinations (nPr vs nCr, repeated items)
Weak spot- Statistics Lecture 4.7: Fundamental Counting Rule, Permutations and CombinationsProfessor Leonard (YouTube) · video · 1 h 37 min
- Permutations and Combinations TutorialThe Organic Chemistry Tutor (YouTube) · video · 18 min
- Combination formula | Probability and combinatorics | Probability and Statistics | Khan AcademyKhan Academy (official YouTube channel) · video · 11 min
Unit 10 Probability using combinations (committee / lottery style)
- Probability using combinations (video) | Khan AcademyKhan Academy (Statistics and probability > Counting, permutations, and combinations > Combinatorics and probability) · video · 9 min
- Mega millions jackpot probability (video) | Khan AcademyKhan Academy (Statistics and probability > Counting, permutations, and combinations > Combinatorics and probability) · video · 5 min
- Probability with combinations example: choosing groups (video) | Khan AcademyKhan Academy (Precalculus > Probability and combinatorics; the same probability-with-combinations lesson content, hosted under the precalculus path) · video · 4 min
Unit 11 Expected value of a discrete random variable
- Mean (expected value) of a discrete random variable | AP Statistics | Khan AcademyKhan Academy (official YouTube upload of the AP Statistics lesson) · video · 5 min
- Statistics Lecture 5.2: A Study of Probability Distributions, Mean, and Standard DeviationProfessor Leonard (YouTube Statistics lecture series) · video · 1 h 13 min
- How To Calculate Expected ValueThe Organic Chemistry Tutor (YouTube) · video · 7 min
Unit 12 Binomial distribution (binompdf / binomcdf, mean of a binomial)
Weak spot- Binompdf and binomcdf functions | Random variables | AP Statistics | Khan AcademyKhan Academy (official YouTube upload) · video · 5 min
- Statistics Lecture 5.3: A Study of Binomial Probability DistributionsProfessor Leonard (YouTube) · video · 1 h 33 min
- Binomial distributions | Probabilities of probabilities, part 13Blue1Brown (YouTube) · video · 13 min
Unit 13 Exam review for Chapters 1–2 (whole-chapter review videos / practice tests)
- Displaying and comparing quantitative data | Khan AcademyKhan Academy · exercise
- Statistics Lecture 1.3: Exploring Categories of Data, Levels of MeasurementProfessor Leonard (YouTube) · video · 32 min
- Statistics Lecture 2.2: Creating Frequency Distribution and HistogramsProfessor Leonard (YouTube) · video · 1 h 7 min