This document presents solutions to statistical problems from an ECON 2210 test, focusing on topics such as confidence intervals, hypothesis testing, and sample size determination. The solutions cover various scenarios, including calculating confidence intervals for average spending, determining required sample sizes for a given margin of error, and conducting hypothesis tests to evaluate claims about average values. The document also includes explanations of Type I and Type II errors, the power of a test, and the Central Limit Theorem. Detailed step-by-step calculations, formulas, and interpretations of results are provided, offering a comprehensive review of statistical concepts. The assignment also includes a review of the test questions and solutions for the Honda car owners' example, covering confidence intervals and hypothesis testing related to the average kilometers driven.