Analytic Epidemiology Designs: In 2011, the United States Food and Drug Administration reported a shortage of vital chemotherapy drugs, which in turn interfered with clinical trials and contributed to probable challenges in evaluating data from those studies. According to the National Institutes of Health, considerable research trials were hindered by shortages of drugs for treatment of infectious diseases and cancer (Allen, 2011). One of the most important aspects of the advancement

Sampling Designs and Evaluability Assessments Identify and discuss 2 types sampling designs, their benefits and limitations In essence, non-probability sampling and probability sampling are the only two types of sampling designs. Non-probability sampling: A researcher selects a small proportion of the units to represent the whole. The selection is deliberate without any defined procedure. For example, if the objective of the researcher is to study the economic conditions of a particular population residing in

Generally, research may be quantitative or qualitative. Nonetheless, the usage of the two methods at the same time is common -- the mixed methods approach. Indeed, using both qualitative and quantitative approaches overcomes the limitations inherent in each approach, resulting in a better understanding of the research problem (Creswell & Clark, 2011). This paper identifies the major components of mixed methods research design and the strengths and weaknesses of the

Validity in Quantitative Research Designs Validity Quantitative Research Designs Validity research refers extent researchers confident effect identify research fact causal relationships. If low validity a study, means research design flawed results . Threats to internal validity in quasi-experimental designs Quasi-experimental studies have several issues that lead to lack of internal validity of the study. These occur as a result of the experimental conditions not being highly controlled or randomized. This leads to intervention

Development Change Research Issue Developmental change is a broad topic that incorporate several sub-topics relating to an individual's growth and development. The broad nature of this topic emerges from the fact that its an approach that is geared towards explaining how infants, children, and adults change over a period of time. The process of explaining individuals' developmental changes over time involves examining a wide range of theoretical areas including biological, cognitive,

88). To make the non-experimental anthropological study of freshman in a dorm room experimental, a study could be constructed of multiple variable factors (such as high school grades, number of roommates, major, gender) to determine what variables were present in students with higher grades. By submitting questionnaire to students in the dorm room and determining which variables, when present, seemed to correlate with higher grades and were potential 'causal' factors