question archive The accompanying table gives summary data on cube compressive strength (N/mm2) for concrete specimens made with a pulverized fuel-ash mix
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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 67 27.98 4.85 28 75 36.74 6.41 Calculate a 99% CI for the difference between true average 7-day strength and true average 28-day strength. (Use H0: μ7 − μ28 = 0. Round your answers to two decimal places.) ,
( , )N/mm2
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