Question: The accompanying table gives summary data on cube compressive strength (N/mm2 ) for concrete specimens made with a pulverized fuel-ash mix (A Study of Twenty-FiveYear-Old

The accompanying table gives summary data on cube compressive strength (N/mm2

) for concrete specimens made with a pulverized fuel-ash mix (“A Study of Twenty-FiveYear-Old Pulverized Fuel Ash Concrete Used in Foundation Structures,” Proc. Inst. Civ. Engrs., Mar. 1985: 149–165)

Calculate and interpret a 99% CI for the difference between true average 7-day strength and true average 28-day strength.

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