NURS 339 Study Guide - Final Guide: Concurrent Validity, Internal Consistency, Factor Analysis
Document Summary
Summary points ch 10: sampling is the process of selecting elements from a population, which is an entire aggregate of cases. Sampling bias is the systematic overrepresentation or underrepresentation of some segment of the population: nonprobability sampling (in which elements are selected by nonrandom methods) includes convenience, quota, consecutive, and purposive sampling. Large samples are preferable because they enhance statistical conclusion validity and tend to be more representative, but even large samples do not guarantee representativeness: data collection methods vary in terms of structure, quantifiability, and objectivity. Biophysiologic measures have the advantage of being objective, accurate, and precise: in developing a data collection plan, the researcher must decide who will collect the data, how the data collectors will. The higher the reliability of an instrument, the lower the amount of error in obtained scores: there are different methods for assessing an instrument"s reliability and for computing a reliability coefficient.
