Answer
We are 95% confident that the mean amount of time Americans age 15 or older spend eating and drinking each day is between 1.18 and 1.26 hours.
Work Step by Step
Here we have n = 1001, df = n-1 = 1000, x̅ = 1.22 and s = 0.65
Confidence = 95%
α = 1 - 0.95 = 0.05, α/2 = 0.025, $t_{α/2} = 1.962$
$E = 1.962 \times \frac{0.65}{\sqrt 1001} = 0.04 $
Lower Bound = x̅ - E = 1.22 - 0.04 = 1.18
Upper Bound = x̅ + E = 1.22 + 0.04= 1.26
