In planning both market opportunity and production levels, being able to estimate the size of a market can be important. Suppose a nappy manufacturer wants to know how many nappies a 1-month-old baby uses during a 24-hour period. To determine this usage, the manufacturer?s analyst randomly selects 15 parents of 1-month-olds and asks them to keep track of nappy usage for 24 hours. The results are shown. Construct a 95% confidence interval to estimate the average daily nappy usage of a 1 month-old baby. Assume that nappy usage is normally distributed.

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