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Activity Four: Confidence Intervals – Sigma unknown Suppose it takes, on average, 10 days to deliver...

Activity Four: Confidence Intervals – Sigma unknown

Suppose it takes, on average, 10 days to deliver a computer to a customer. This statistic was generated from observing 100 deliveries. The population standard deviation is unknown, but from your observation of 100 deliveries, you calculate the sample standard deviation to be 2 days. The shipping manager would like to construct a 95% and 99% confidence interval (CI) estimate of delivery time. You estimate the mean delivery time to fall between ___ and ___ days, and this statement is correct (i) 95% of the time; (ii) 99% of the time. The correct numbers for the range for each CI are?

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