The article Flexure of Concrete Beams Reinforcedwith Advanced Composite Orthogrids (J
Chapter 9, Problem 30(choose chapter or problem)
The article Flexure of Concrete Beams Reinforcedwith Advanced Composite Orthogrids (J. of AerospaceEngr., 1997: 715) gave the accompanying data on ultimateload (kN) for two different types of beams.Sample Sample SampleType Size Mean SDFiberglass grid 26 33.4 2.2Commercial 26 42.8 4.3carbon grida. Assuming that the underlying distributions are normal,calculate and interpret a 99% CI for the differencebetween true average load for the fiberglassbeams and that for the carbon beams.b. Does the upper limit of the interval you calculated inpart (a) give a 99% upper confidence bound for thedifference between the two ms? If not, calculatesuch a bound. Does it strongly suggest that true averageload for the carbon beams is more than that forthe fiberglass beams? Explain.
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