Which of the following hypothetical examples would result in the most precise measurement?

A "virtually certain" confidence interval (Use Z=3.0) for the average wait times for scheduling an appointment with a primary care physician based on a sample average of 11.4 days with a population standard deviation of 2.3 days based on a sample size of 246 households.

A 95% confidence interval for the average wait times for scheduling an appointment with a primary care physician based on a sample average of 9.4 days with a population standard deviation of 3.4 days based on a sample size of 73 households.

A 95% confidence interval for the average wait times for scheduling an appointment with a primary care physician based on a sample average of 7.3 days with a population standard deviation of 2.9 days based on a sample size of 81 households.