A courier service advertises that its average delivery time is less than 6 hours for local deliveries. A random sample of times for 12 deliveries to an address across town was recorded. These data are shown here. Calculate the 95% confidence interval using the following dataset:

3.03

6.33

6.50

5.22

3.56

6.76

7.98

4.82

7.96

4.54

5.09

6.46