What is measured by the denominator of the z-score test statistic? O a. The average distance between Mand u that would be expected if Ho was true O b. Whether or not there is a significant difference...

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Extracted text: What is measured by the denominator of the z-score test statistic? O a. The average distance between Mand u that would be expected if Ho was true O b. Whether or not there is a significant difference between M and u O c. The position of the sample mean relative to the critical region O d. The actual distance between M and u