The effect of the breast cancer diagnosis of the celebrity during the study gives an effect on the research finding called history.
A research study is a study of nature that usually includes processes. It is done to discover information, prove hypothesises, and overall answer a question or concern using scientific methods.
In the case of the question above, the event that occurred to the celebrity (which is a breast cancer diagnosis) is an event outside the experimental setting but may have had an effect on the dependent variable of the study. Therefore, it can be classified or called a history effect.
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