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The section on bias and measurement investigates the effect of bias on observation, aptitude and achievement tests, vocational tests, and affective tests. Bias and sampling are discussed covering the sources of bias (composition and selections of samples, the effects of single sex or race samples, organizations, use of different race or sex samples for different content areas), and the results of that bias. The effects of these sources in terms of incomplete testing for race or sex similarities and differences, use of biased independent variables, and incomplete blocking or control of confounding variables are discussed. of invalidity can be sources of bias in design are examined.

How knowledge of appropriate literature, selection of independent variables, and control of sources. In selecting topics, potential sources of bias such as funding sources and publishing patterns are covered. The effects of racism and sexism can be seen in the various elements of research methods including the selection of topics, design, sampling, measurement, and the generation of conclusions. To obtain a good quality of research results, the research must have clear objectives and focused so that the implementation of the The development of educational research is a key to successful education, so that the quality of educational research becomes points which are essential in order to improve the quality of education. The function of the research is to answer a variety of current issues and challenges in education in accordance with the function and purpose of the study itself. INTRODUCTION Research in education is one of the most important activities. Data collection technique used was a questionnaire in which the percentage was 49% and the analytical techniques used were descriptive statistical analysis techniques in which the percentage was 80%. The sampling technique used was purposive sampling in which the percentage was 43%. The number of samples used were 30-100 people in which the percentage is 54%. Variables used in the study were 2 variables in which the percentage was 55%. The research method frequently used was ex post facto method in which the percentage was 27%. The research results showed that the trend of the use of the highest research approach was qualitative research approach in which the percentage was 49%. The data analysis technique used is descriptive statistics.

Data collection technique used is the check list, observation, and additional data from the study of literature. The samples used were 75 reports of student thesis FT-UNY with every year is 15 reports from 2010 to 2014. The sampling technique used is proportional random sampling at 9 undergraduate programs of vocational education courses based on the year of manufacture thesis. Place of research is the Faculty of Engineering, Yogyakarta State University. This study is a descriptive study with a quantitative approach. This study aimed to describe trends regarding the use of student research methodology in Yogyakarta State University. The determination of research methodology must be based on criteria in accordance with the characteristics of the problems studied. One important point to produce high-quality research is a research methodology. This indicates that the quality of research has great influence on the development of science and technology itself. The expansion of science and technology depend on the progress of research. Research is the process of collecting information that aims to improve and develop knowledge through investigation.