The manager of a credit card firm has recorded the times for a simple random sample of 60 calls made by customers inquiring about an issue with their credit cards. The sample mean and standard...

The manager of a credit card firm has recorded the times for a simple random sample of 60 calls made by customers inquiring about an issue with their credit cards. The sample mean and standard deviation of these calls are 12 minutes and 5 minutes, respectively.

1. Construct and interpret the 95% confidence interval for the mean.


2. There is a chance that the population is strongly skewed in the negative direction; that is, some calls might take 25 or 30 minutes. If this were true, would the interval constructed in question a still be appropriate? Explain your answer.