Week 4

Week 4; Quantitative design 1 (Experiments)

               Why the experimental research are important?

💧Experimental Research is most used in medical ways, with animals. 

💧Every single new medicine or drug is testing using this research design. 

💧There are countless variations of experimental research, including: probability, sequential, snowball, and quota.

Randomization

 is a way to control the complications caused by the groups and the experimental methods. The sampling is divided into two stages such as

1. Random selection is a randomly selected unit from all populations which the opportunity to be represented equally.

2. Random assignment is randomly assigned to one of the experiments which each unit is experimented equally.

Control, is the control of other complications, such as

laboratory environment. Laboratory method is the scientifically accepted way of controlling the environment. However, in the social sciences, it is a study of human beings. Laboratory method in the court room cannot be done because of the ethical and moral implications of humanism.

Blinding, is to use a blinding method to prevent bias in research, such as research on patient treatment. There are two types of blinding :

1. Single-blinded means that the patient does not know what he or she is being treated with.

2. Double-blinded means both the patient and the researcher do not know who is treated.

The best experimental research is a well-controlled trial and random sampling. Both the researcher and the study group did not know which group they belonged to that we call Randomized double blind control trial (RCT).

RCT must be consisted of

1.     Random allocation

2.     Double blind, both participants and researchers did not know which group               they belonged to.

3.     Control other variables strictly on the basis of the experiment.

        The advantages of experimental method:

• Experimental research is the most appropriate way for drawing causal conclusions, regarding interventions or treatments and establishing whether or not one or more factors causes a change in an outcome. 
• Due to the controlled environment of experimental research, better results are often achieved.
• In the case of laboratory research, conditions not found in a natural setting can be created in an experimental setting that allows for greater control of extraneous variables.
  
  The disadvantages of experimental method:

• Experimental research can create artificial situations that do not always represent real-life situations. 
• Human error also plays a key role in the validity of the project as discussed in previous modules.
• It may not be really possible to control all extraneous variables. 
• The research must adhere to ethical standards in order to be valid. 
• If an experimental study is conducted in its natural environment, such as a hospital or community, it may not be possible to control the extraneous variables.
  
  
  Prapasri   Poopayang