Implications and limitations The sample in the research was a proposed study in the National Football players’ league. The players interviewed suffered from head injuries, causing the Chromic Traumatic Encephalopathy. The sample for the research is the players with head injuries. In a research, the proposed sample should reflect coverage of the represented population. There are implications posed by the sample used and the instruments available in measuring the sample. First, the research deals with an investigation of the case and control groups. The empirical measurement of the research entails the exclusion and inclusion methods, which may not be helpful in ascertaining the exact number of players who have suffered from Chronic Traumatic Enephalopathy (Boston University, 2009). The proposed sample used in the research is not only small but highly restrictive. The sample is highly constricted because the research is retrospective, and hence has numerous implications. It means that few players will be selected, and hence they may not fully represent the entire population. In the course of the research, follow-ups on the participants is required, which is exceedingly costly hence the sample is reduced. The reduction of the players means that the research is restrictive and cannot be relied to give valid results. The proposed results will have certain implications to the players. The researcher may dispel with different requirements, hence requiring different variables to complete the research study (Nelson, 2012). The comparison of the interviews taken will include many assumptions and the decisions made may be marred by assumptions. The statistical distribution of tables to analyze the correlation factors and the interviews has an error margin and has a low level of accurate data processing. The limiting factors present a possibility of errors in the research. The greatest limitation is the fact the sample of retired football players with head injuries is extremely limited. The implication is that fewer players in the National Football League have suffered from head injuries. The disease is said to occur after the retirement of the players, which means that a lot of time may be taken in establishing the right sample. In addition, most of the players who have retired have not tested for the disease (Holbrook, 2009). The measuring methods in the research are likely to be interfered with by other factors and may be highly affected. The testing of their reliability will occur after the research is finished. Therefore, the internal and external consistency may be lost in the time of making the measurements. Though the use of inter-observer tests will be applied in measuring the validity, there are many errors which may not be detectable. Hence, the research may rely on assumptions only (Boston University, 2009). Appendices and References The research will take approximately two years to be concluded. The period proposed will be enough to select the sample to be used in the research. The first three months of the two years will be spent in preparing the required documents, such as the consent and authority to conduct research. Five months will be used in selecting the sample using the purpose method, and three months will be used in preparing the questionnaires and formulating the questions to be asked in the interviews. It is within the three months that partici