Question

The average time spent by an adult male at the gym (per visit) is claimed to be equal to 104.05 minutes.
A sample consisting of 12 gym patrons and the time spent by them at the gym (per visit) are ,
100 , 101 , 98 , 106 , 99 , 101 , 105 , 99 , 109 , 105 , 108 , 109
a. Obtain a 95% condence interval for the average time spent by an adult male at the gym.