The level of statistical significance is set by the investigator in terms of the amount of risk or willingness to be in error in rejecting the null hypothesis assuming a significant relationship).

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The level of statistical significance, often denoted as alpha (α), is indeed set by the investigator and represents the threshold for the probability of rejecting the null hypothesis when it is actually true (Type I error). This level reflects the investigator's tolerance for risk or error in concluding that a significant relationship exists.

The Level of Statistical Significance Is Set by the Investigator