![]() The research hypothesis must be a clear, concise prediction of what is expected to be demonstrated in the experiment. Here is some more information on operationalisation of variables. Thus, they need to have operational definitions. It is important that a research knows exactly what their independent and dependent variables are. So the aim of this research study could be stated as “ To investigate the effects of acetylcholine on rats’ procedural memory of running through a maze.” So the DV was the level of acetylcholine in the brain and the DV was the ability to navigate through a maze. They measured the effects of acetylcholine on their memory by training them how to run through a maze and then timing their performance and counting their mistakes after the injections. ![]() Therefore, the IV was the injection the rats were given that would change the level of aceytlcholine in the brain. One group received an injection that increased the level of acetylcholine in the brain, a second received an injection that decreased the level and the third group received no injection (control group). They divided the rats into three groups and gave each group a different injection. Researchers wanted to find out if the level of the neurotransmitter acetylcholine would influence rats’ memories. The aim of an experiment, therefore, is usually to investigate the effect of the IV on the DV. In other words, it is the factor that changes in the different conditions of the experiment. The IV is what is being manipulated by the researcher. These two variables we call in an experiment the independent variable (IV) and the dependent variable (DV). In experiments, this usually involves investigating the cause and effect relationship between two variables. The “aim” of a research study simply refers to what it intends to find out. Here are the learning targets and the glossary for this topic. State a research and null hypothesis of a study ( HL only ).State operational definitions of variables.State the independent and dependent variables in an experiment.Experimental Research General Learning Targets
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