Question: Suppose the sample mean and std deviation for Co2016 of monthly e comm spending is 750 and 1500. My sample is 200 odd folks registered

Suppose the sample mean and std deviation for Co2016 of monthly e comm spending is 750 and 1500. My sample is 200 odd folks registered with MKTR. What is the 95% confidence interval that I can tie around this mean estimate for batch as a whole

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