The article "Flexure of Concrete Beams Reinforced with Advanced Composite Orthogrids" (J. of Aerospace Engr, 1997: 7-15) gave the accompanying data on ultimate load (kN) for two different types of beams. Sample Sample Sample Mean Туре SD Size 33.4 2.2 Fiberglass grid 26 26 42.8 4.3 Commercial carbon grid a. Assuming that the underlying distributions are normal calculate and interpret a 99% CI for the difference between true average load for the fiberglass beams and that for the carbon beams. b. Does the upper limit of the interval you calculated in part (a) give a 99% upper confidence bound for the difference between the two us? If not, calculate such a bound. Does it strongly suggest that true average load for the carbon beams is more than that for the fiberglass beams? Explain

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The article "Flexure of Concrete Beams Reinforced with
Advanced Composite Orthogrids" (J. of Aerospace Engr,
1997: 7-15) gave the accompanying data on ultimate load
(kN) for two different types of beams.
Sample
Sample
Sample
Mean
Туре
SD
Size
33.4
2.2
Fiberglass grid
26
26
42.8
4.3
Commercial
carbon grid
a. Assuming that the underlying distributions are normal
calculate and interpret a 99% CI for the difference
between true average load for the fiberglass beams and
that for the carbon beams.
b. Does the upper limit of the interval you calculated in part
(a) give a 99% upper confidence bound for the difference
between the two us? If not, calculate such a bound.
Does it strongly suggest that true average load for the
carbon beams is more than that for the fiberglass beams?
Explain
Transcribed Image Text:The article "Flexure of Concrete Beams Reinforced with Advanced Composite Orthogrids" (J. of Aerospace Engr, 1997: 7-15) gave the accompanying data on ultimate load (kN) for two different types of beams. Sample Sample Sample Mean Туре SD Size 33.4 2.2 Fiberglass grid 26 26 42.8 4.3 Commercial carbon grid a. Assuming that the underlying distributions are normal calculate and interpret a 99% CI for the difference between true average load for the fiberglass beams and that for the carbon beams. b. Does the upper limit of the interval you calculated in part (a) give a 99% upper confidence bound for the difference between the two us? If not, calculate such a bound. Does it strongly suggest that true average load for the carbon beams is more than that for the fiberglass beams? Explain
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