Exam 1 Review – Statistics & Probability 2025/2026 | 35 Solved Questions on Data Types, Z-Scores, Distributions, and Probability Rules

This comprehensive 2025/2026 review guide presents 35 accurately answered exam questions designed to prepare students for their first exam in introductory statistics and probability. It covers the essential foundational concepts that students must master for success in early college-level statistics courses or research methodology modules. Key topics include: Basic Statistical Definitions: population, sample, variable, parameter, statistic Data Types & Measurement Scales: nominal, ordinal, interval, ratio, discrete vs continuous variables Descriptive Statistics: mean, variance, standard deviation, skewness, histogram shapes (bell-shaped, symmetric, bimodal) Z-Scores & Distribution Analysis: interpreting standard deviations from the mean Empirical Rule: 68-95-99.7 rule for normal distributions Fundamental Probability Concepts: union, intersection, complement, conditional probability, mutually exclusive events This resource is especially useful for students in: Introductory Statistics (College/University Level) AP Statistics or Dual Enrollment Math Courses Research Methods in Psychology, Sociology, or Education Business Statistics or Economics Programs STEM Majors requiring a statistical foundation Whether used for quizzes, midterm prep, or foundational reinforcement, this document offers clear definitions, real-world terminology, and practical application, giving students a strong start in statistical reasoning and probability interpretation. Keywords: statistics exam review, data types, nominal ordinal interval ratio, z-score, mean, standard deviation, skewness, histogram shapes, probability rules, conditional probability, sample and population, empirical rule, mutually exclusive events, union of events, probability concepts, discrete and continuous variables