A sample of 10 was taken from an in-control process. A variance of 4.2 and a mean of 23.2 were calculated. Determine the 95% confidence interval on the mean and standard deviation. Explain any...

A sample of 10 was taken from an in-control process. A variance of 4.2 and a mean of 23.2 were calculated. Determine the 95% confidence interval on the mean and standard deviation. Explain any potential problems with this analysis.

A sample from an in-control/predictable process had a variance of 4.2 and a mean of 23.2. Determine the 90% lower confidence bound on the mean and standard deviation. Describe any potential problems with this analysis.