The blood alcohol concentration (BAC) level in a sample of 18 blood specimens is tested. This sample was found to have a mean BAC of 51% with a standard deviation of 6% . Calculate the 95% confidence...

The blood alcohol concentration (BAC) level in asample of 18 blood specimens is tested. This sample was found to have ameanBAC of51% with astandard deviation of6%. Calculate the95% confidence interval for this sample to thenearest whole number. Report only theLOWER LIMIT of your confidence interval