Show transcribed image text As part of a larger project to study the behavior of stressed-skin panels, a structural component being used extensively in North America, an article reported on various mechanical properties of Scotch pine lumber specimens. Data on the modulus of elasticity (MPa) obtained 1 minute after loading in a certain configuration and 4 weeks after loading for the same lumber specimens is presented here. Observation 1 min 4 weeks Difference 10,470 16,620 13,250 17,400 15,480 12,730 12,910 10,120 17,260 14,570 13,400 13,900 11,100 1280 3370 2680 2750 2790 9,190 14,720 2180 2800 11,220 11,420 10,920 10 13,210 14,370 12,110 11,700 15,470 12,590 17,840 14,00 10,550 14,760 2260 3010 12 13 8,690 3510 2530 12,230 Calculate an upper confidence bound for the true average difference between 1-minute modulus and 4-week modulus; first check the plausibility of any necessary assumptions. (Use α = 0.05. Round your answer to two decimal places.) MPa Interpret your upper confidence bound. we are 95% confident that the true mean difference between 1-minute modulus and 4-week modulus is at most the upper bound. o we are 95% confident that the true mean difference between 1-minute modulus and 4-week modulus is at least the upper bound. we are 95% confident that the true mean difference between 1-minute modulus and 4-week modulus is never the upper bound. o we are 95% confident that the true mean difference between 1-minute modulus and 4-week modulus is exactly the upper bound.
As part of a larger project to study the behavior of stressed-skin panels, a structural component being used extensively in North America, an article reported on various mechanical properties of Scotch pine lumber specimens. Data on the modulus of elasticity (MPa) obtained 1 minute after loading in a certain configuration and 4 weeks after loading for the same lumber specimens is presented here. Observation 1 min 4 weeks Difference 10,470 16,620 13,250 17,400 15,480 12,730 12,910 10,120 17,260 14,570 13,400 13,900 11,100 1280 3370 2680 2750 2790 9,190 14,720 2180 2800 11,220 11,420 10,920 10 13,210 14,370 12,110 11,700 15,470 12,590 17,840 14,00 10,550 14,760 2260 3010 12 13 8,690 3510 2530 12,230 Calculate an upper confidence bound for the true average difference between 1-minute modulus and 4-week modulus; first check the plausibility of any necessary assumptions. (Use α = 0.05. Round your answer to two decimal places.) MPa Interpret your upper confidence bound. we are 95% confident that the true mean difference between 1-minute modulus and 4-week modulus is at most the upper bound. o we are 95% confident that the true mean difference between 1-minute modulus and 4-week modulus is at least the upper bound. we are 95% confident that the true mean difference between 1-minute modulus and 4-week modulus is never the upper bound. o we are 95% confident that the true mean difference between 1-minute modulus and 4-week modulus is exactly the upper bound.
