Level 3 Inference Learning Workbook covers NCEA Level 3 Achievement Standard 91582 (Mathematics and Statistics 3.10): Use statistical methods to make a formal inference. This standard is internally assessed and worth 4 credits. The workbook features: concise theory notes with brief, clear explanations worked examples with key concepts and skills explained relevant sets of exercises for student practice answers to all exercises, provided in the back of the book practice assessment task with fully worked solution. An index gives easy access to important terms and definitions highlighted in the text. This workbook covers the use of statistical methods in order to make a formal inference, according to the statistical enquiry cycle. Based on research, the purpose of the investigation is developed, and an appropriate comparison question posed. Sample data are displayed and summary statistics are calculated. Features of the sample distributions are discussed, including sampling variability and the variability of estimates. Statistical and contextual knowledge are combined to communicate findings in a conclusion. This write-on workbook may be used by teachers for classroom practice, or by students as a homework book or revision guide. The write-on format keeps notes and exercises together in a compact form, providing a useful revision tool for end-of-topic assessments.