The researcher traces what occurs and does not interfere with the experiment.
Qualitative research, on the other hand, uses a naturalistic methodology that is the researcher observes facts or actions as they happen in real life or in a specific setting. The basic difference is that quantitative research uses the theory of picking up knowledge can only be through direct observation and experimentation (logical positivism). Research is either quantitative or qualitative. This essay explains what is validity in both types of research and what is construct validity. Research is either quantitative or qualitative a test has construct validity if it displays a correlation between the test scores and a predefined theoretical trait.
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