For your senior project, you want to learn more about the effect of brain damage on an individual’s ability to learn a new language. You don’t really have the time or resources to observe or interview and talk to people with brain damage. Ethically, you can’t manipulate the independent variable. You need something that is quick and easy so you can turn your project in on time. Based on what you know about different research methods and designs, which approach to research would you use?

Survey  

Explanation:

Survey: In psychological research, the term "survey" is described as one of the different research methods that are being used for collecting data or information exactly as it has been reported by the participants or individuals. The given type of "data collection" is also referred as "self-report data", that means or signifies that individuals tend to complete or fulfill the survey by themselves i.e, they have provided the complete information about themselves.

In the question above, the given statement represents the survey.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.