A team of mechanical engineering students is analyzing tensile strength of bars used to build a model truss bridge. An instructor tells the students that tensile strength is approximately normally distributed with variance 02 = 500 N 2. A random sample of 25 bars has a mean tensile strength of J? = 1025 N. a) Construct a 99% two-sided CI on mean tensile strength. b) Compare the width of the 99% CI with the width of the 95% CI: that is, evaluate and report the width 0f99% CI ratio . width of 95% c1