Example 7.11 gave data on the modulus of elasticity obtained 1 minute after loading in a certain configuration. The cited article also gave the values of modulus of elasticity obtained 4 weeks after loading for the same lumber specimens. The data is presented here.

Observation 1 min 4 weeks Difference 1 10,490 9,110 1380 2 16,620 13,250 3370 3 17,300 14,720 2580 4 15,480 12,740 2740 5 12,970 10,120 2850 6 17,260 14,570 2690 7 13,400 11,220 2180 8 13,900 11,100 2800 9 13,630 11,420 2210 10 13,260 10,910 2350 11 14,370 12,110 2260 12 11,700 8,620 3080 13 15,470 12,590 2880 14 17,840 15,090 2750 15 14,070 10,550 3520 16 14,760 12,230 2530 Calculate and interpret 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.