Credit to examine species (2551 (2008): 50), meaning that the trial was about the relationship between cause and effect under conditions simulating actual saphaokan to be able to control the variables involved, so that the results meet the objectives.Chu SI Rattana dynasty and ongat words, Pat (2551 (2008): 2), meaning that the trial is to research the action variable to determine whether or not the true cause to be experimental. Then observe the effects that occur with other variables that control does not need to learn to live in a constant condition. Foster played an innocent punnpreeda (2540 (1997): 131), meaning that the trial is to find out the facts on which the relationship between cause and effect (cause and effect relationship) occurred under the phaokan. Control From the research, it may be concluded that the trial is a research study to research the complex cause and effect relationships. (Cause and effect relationship) between research variables can be controlled by a variable that is causing this is controlled and organized Act (manipulation) with independent variables, or what the intervention study.The General intention of the research experiment.Experimental research with a significant intention as follows:1.1 in order to find out the facts of the cause that produces results.1.2 in order to study the relationship between the cause and the effect of the phenomenon.1.3 in order to bring the research results to make up the rules. Theoretical formula.1.4 in order to analyze or search job imperfections to be revised or developed to more efficiently.1.5 trial results to be applied.2. samples used in research experimentsIn the research trial always have samples that are used in the two types of research.2.1 experimental groups (the Experimental group) refers to a sample that has been performed (treatment) in the experiment used a symbol E.2.2 control group (Control group) means that the sample group who provided research looks like a trial group. But don't get to do probably let the natural condition is met. This is for the sake of the experimental groups compared with the commonly used symbol C.3. the variables used in the research trialTo understand more about experimental research. So the major variables mentioned in the trial, which has 4 types as follows:3.1 independent variable or variables (Independent variable) is a variable that researchers set up experiments in order to do that, it "cause" or not. The independent variables are sometimes called experimental variables (variable Experimental) or variables are made popular symbol X.3.2 variable (Dependent variable) as the variable that needs to know what is the "effect" arising from the "cause" or not using the symbol Y.3.3 ตัวแปรเชื่อมโยง (Intervening variable) หรือเรียกอีกอย่างหนึ่งว่า ตัวแปรสอดแทรก เกิดขึ้นจากกระบวนการทางจิตวิทยาระหว่างดำเนินการทดลอง จึงไม่สามารถควบคุมตัวแปรชนิดนี้ได้และมีผลต่อพฤติกรรมที่แสดงออกมาด้วย จากการที่ตัวแปรนี้เกิดขึ้นระหว่างตัวแปรอิสระและตัวแปรตาม จึงอาจเรียกว่า ตัวแปรภายใน ก็ได้ เช่น ความโกรธ ความวิตกกังวล การปรับตัว การจูงใจ เป็นต้น3.4 the variable external variables or complications (Extraneous variable) is a variable that occurs and can grant the trial results influence research who do not want to happen or do not know. With this variable type, researchers can determine how to control. It is also known as the control variable (variable Control)Variables, complications may arise from different sources, as follows:1) from a sample or a sample of the population groups that are used in the experiment caused a lot of variables such as age, complications have basic knowledge, level of education, nationality. In accordance with an intellectual personality The condition of families interested in attitudes, etc.2) from trial operation method and experimental research on testing. How to perform experiments and tests, there may be complications caused by variables such as error in the procedure. The quality of the tools that are used to test the time spent testing, investigation, Bias of the time used in the experiment.3) from external sources. The environment also causes a variable insert in the same trial as the atmosphere during the trial. Noise Inappropriate places, etc., but these complications variable research can be controlled.4. the variable control complicationsได้กล่าวมาแล้วว่า ในการวิจัยเชิงทดลองนั้นย่อมมีตัวแปรแทรกซ้อนเกิดขึ้นเสมอ ซึ่งผู้วิจัยจะต้องควบคุมตัวแปรชนิดนี้ให้หมดไป เพื่อจะได้ทราบว่าตัวแปรตามเป็นผลมาจากตัวแปรอิสระอย่างแท้จริง การควบคุมตัวแปรแทรกซ้อนนิยมใช้หลักการควบคุมที่เรียกว่า Max-Min-Con Principle ดังต่อไปนี้4.1 to the variance is the system, as much as possible (Maximized systematic variance) is the variable control complications by increasing the variance between groups or variance due to the experiment, maximum, which is done by defining the method of experimental control group and experimental group, different and independent of each other, as well as the control of time and appropriate experimental conditions, so that they can be made to the independent variable to send the most variable phato.4.2 reducing the variance of the error (error Minimized variance) is the variable control complications by making the variance of the discrepancies are minimal or zero. That bias (Error) break into 2 types, as follows:1) systematic bias (Systematic error) is a bias that affects the entire sample group equally, such as malfunctions of instrumentation error test timer, etc., which researchers are able to fix this error. That is, if you know that there is a defect metrics to solve discrepancies by creating tools to measure precision and confidence is high as well, it is with high efficiency and ponnai.2) bias for randomly (Random error) is a bias born with partial samples. Cause of occurrence of complications, such as variables or negligence. To guess their experiment. Attention Emotional health, body, etc., this type of error can be corrected by using the normal distribution (the Normal distribution law) statistical calculations to be performed on the bias.4.3 c
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