This document provides an overview of key concepts in data collection and analysis. It defines different types of data, such as primary and secondary data, and variables like independent, dependent, and mediating variables. It also discusses important steps in data processing like editing, coding, data entry, and cleaning. The document explains why computers are useful for data processing and analysis. It then covers specific techniques for coding, entering data into spreadsheets, and cleaning data. Finally, it discusses different types of data analysis including descriptive and inferential statistics, and choosing the appropriate analytical techniques based on factors like sampling design and variable types.