What is a 95% confidence interval for the time my coworkers can stay awake on average for all of my coworkers?

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I am called upon to embark on a study. My goal is to restore productivity through the use of caffeine.  In order to see if   caffeine really works, I have observed the time, in hours, a random selection of ten of my coworkers who could stay  awake at the extremely long-winded manager's meeting as soon as it started.  One fell asleep even before the meeting started! 1.9     0.8     1.1     0.1     -0.1 4.4     5.5     1.6     4.6     3.4 I have to complete a report to the CEO's Office on the effectiveness of caffeine but I need the following information:    What is a 95% confidence interval for the time my coworkers can stay awake on average for all of my coworkers?