Answer
we have n = 4, x̅ = 1825, s = 834, df = 3
$s_{x̅} = \frac{834}{\sqrt 4} = 417$
Using Table C of the book for 90% Confidence Level, we have:
t = 2.353
Lower Bound = 1825 - (2.353)(417) = 843.80
Upper Bound = 1825 + (2.353)(417) = 2806.20
Work Step by Step
Given above