Question: When should a pooled standard deviation be used? Oa. When the results do not adhere to the normal distribution. Ob. When the results of experiments

When should a pooled standard deviation be used? Oa. When the results do not adhere to the normal distribution. Ob. When the results of experiments are being compared O c. When the standard deviations of the results being compared are not equal. d. When the measuring scales are different

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