Answer
Here we have n = 30, x̅ = 11.58, s = 4.37, df = 29 and Confidence Level = 95%
Using Table C of the book we have t = 2.074
$s_{x̅} = \frac{4.37}{\sqrt 24} = 0.89$
Lower Bound = 11.58 - (2.074)(0.89) = 9.73
Upper Bound = 11.58 - (2.074)(0.89) = 13.43
Work Step by Step
Given above