Before we begin our discussion of the types of statistical studies, we look closely at the types of research questions used in statistical studies. Usually, it is not possible to study the whole popul...Before we begin our discussion of the types of statistical studies, we look closely at the types of research questions used in statistical studies. Usually, it is not possible to study the whole population, so we collect data from a part of the population, called a sample. Note: In the previous section, Research Questions about a Population, we included examples of questions about the relationship between two variables in a population.
