1. The problem statement, all variables and given/known data There's no need to write out the full question, but basically we have 6 diets, and for each one a list of the levels of protein in 10 independant samples for each. Sample mean and standard deviation given. Calculate and interpret a confidence interval centered on the sample mean for diet one. 2. Relevant equations 3. The attempt at a solution The sample mean for diet 1 is 100, SD is 15.1 When it says a confidence interval centered on this, do i just calculate 100+-t*(15.1)/root(10) where t* is the critical value obtained using a t distribution with n-1 = 9 degrees of freedom?