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A researcher tests whether any of 20 different water quality metrics improved in a river after environmental remediation. Each metric is tested independently at the significance level, with no adjustments for multiple comparisons. Assume no metrics truly improved. What is the probability of at least one false positive (Type I error)?
A researcher tests whether any of 20 different water quality metrics improved in a river after environmental remediation. Each metric is tested independently at the significance level, with no adjustments for multiple comparisons. Assume no metrics truly improved. What is the probability of at least one false positive (Type I error)?