Probability and statistics Community Questions Get a personal path through Probability and statistics Independent and dependent events Introduction to probability. Independent and dependent events. Compound events. Mutual exclusive events. Addition rule for probability. Probability and combinatorics Permutations and combinations. Using combinatorics to solve questions in probability. Statistical studies Descriptive statistics Measures of central tendency and dispersion. Mean, median, mode, variance, and standard deviation. Random variables and probability distributions Random variables. Expected value. Probability distributions (both discrete and continuous). Binomial distribution. Poisson processes. Regression Fitting a line to points. Linear regression. R-squared. Inferential statistics Making inferences based on sample data. Confidence intervals. Margin of error. Hypothesis testing.