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You want to get an idea about the average wait time at the DMV, you sample 40 people and find the average of that sample

You want to get an idea about the average wait time at the DMV, you sample 40 people and find the average of that sample is 20 minutes. Why do we not just go with this number? Why is it important to find a confidence interval? Why do we prefer a larger sample to a smaller one in this case?

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