Chapter 20 - Inference about a Population Mean - Chapter 20 Exercises - Page 478: 20.32b

Here we have n = 29, x̅ = 3.938, s = 0.802 $s_{x̅} = \frac{0.802}{\sqrt 29} = 0.149$ For a 95% confidence level, using Table C we have: t = 2.045 Lower Bound = 3.938 - (0.149)(2.045) = 3.63 Upper Bound = 3.938 + (0.149)(2.045) = 4.24

Given above