Exercise #1 (15pt): You're a civil engineer testing the compressive strength of concrete to be used in bridge construction. You test 16 concrete specimens, the resulting in the following compressive strengths (in psi). 2223 2329 2269 2244 2258 2325 2204 2296 2316 2272 2302 2342 2307 2205 2208 2311 Q1 (5pt). Construct a 95% confidence interval for mean strength. Approach: 2pt Computation: 2pt Numerical result: 1ptQ2 (5pt). Construct a 99% confidence interval for mean strength. Approach: 2pt Computation: 2pt Numerical result: 1pt Q3 (5pt). Note what happens to the interval as confidence increases. Discuss. Approach: 2pt Computation: 2pt Numerical result: 1pt