Using the formula for calculating confidence intervals below, find the interval range following this scenario:

A professor records the number of patients each clinical student assists through treatment in the crisis unit each week. Assuming that the standard deviation is known to be 2 patients, use the formula below to construct an approximate 95% confidence interval for the true mean (average) number of patients each clinical student assists each week (round to the second decimal).

Sample mean (x-bar): 16

Standard deviation (): 2

N (sample size): 13