Designed for undergraduate and graduate nursing students, this text presents the basic principles of statistics as applied in medical practice. Covers all essential topics, with worked examples and exercises drawn from nursing and research. Each chapter contains an overview, objectives, examples, exercises and summary of critical concepts. Revised and expanded to include new information on level of measurement and its role in selecting a statistical analysis, calculating standardized scores and their associated probabilities using the normal curve and statistical decisions and their outcomes. Also features new chapters on estimating population parameters and on a decision tree approach for selecting a statistical analysis. This book should be of interest to nurses.