When calculating the confidence interval for an average, the standard deviation is used:

When calculating the confidence interval for an average, the standard deviation is used:









A) because it indicates lack of variability
B) because it is the appropriate measure of variability for a metric variable
C) because it is the appropriate measure of variability for a categorical variable
D) because it is smaller and less expensive to calculate
E) none of the above; standard deviation is not used to calculate confidence for an average













Answer: B


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