Three key points about the document: 1. The document discusses correlational research and survey research methods. It defines correlational research as studying relationships between two or more variables without influencing them. Survey research involves collecting data through questionnaires and interviews to answer hypotheses or questions about populations. 2. The basic steps of correlational research are outlined, including problem selection, sampling, instrumentation, design and procedures, data collection, and data analysis. Threats to internal validity like subject characteristics, location, instrumentation, and mortality are also discussed. 3. The document provides details on longitudinal and cross-sectional survey designs. The key types of longitudinal surveys - trend studies, cohort studies, and panel studies - are explained.