Answer
We are 95% confident that the mean price of a 4 GB flash memory card is between $\$13.707$ and $\$17.057$.
Work Step by Step
Here we have n = 10, df = n-1 = 9, x̅ = 15.382 and s = 2.34
Confidence = 95%
α = 1 - 0.95 = 0.05, α/2 = 0.025, $t_{α/2} = 2.262$
$E = 2.262 \times \frac{2.34}{\sqrt 10} = 1.675 $
Lower Bound = x̅ - E = 15.382 - 1.675 = 13.707
Upper Bound = x̅ + E = 15.382 + 1.675 = 17.057
