The accompanying table gives summary data on cube compressive strength (N/mm2) for concrete specimens made with a pulverized fuel-ash mix. Age (days)     Sample     Size     Sample     Mean     Sample     SD 7     69 26.94 4.84 28     71 35.77 6.46 Calculate a 99% CI for the difference between true average 7-day strength and true average 28-day strength. (Use H0: ?7 − ?28 = 0. Round your answers to two decimal places.)     ,

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