03. (44 points) In the mixing of concrete both the size of the gravel and thickness of the mortar can possibly influence

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03 44 Points In The Mixing Of Concrete Both The Size Of The Gravel And Thickness Of The Mortar Can Possibly Influence 1 (26.97 KiB) Viewed 36 times

03. (44 points) In the mixing of concrete both the size of the gravel and thickness of the mortar can possibly influence the hardness of the resulting concrete 3 levels of gravel size (factor A) and 3 levels of mortar thickness (factor B) were examined in a carefully controlled experiment. For each combination of gravel size and mortar thickness 4 batches of concrete were mixed and tested for hardness with results shown below. Small Medium Mortar thickness (1) Light Medium 3 4 4 12 6 11 8 5 11 5 5 13 5 9 9 7 4 5 3 3 2 6 6 Size of gravel (1) Heavy 16 14 7 10 16 7 9 19 12 4 11 5 large man b. Using a = 0.05 compare the hardness of concrete mixed with heavy thickness mortar to the average of that mixed with medium thickness and light thickness mortar. Hint: Ftab. = 4.21 Fobs 2.SS(H) 7.1. = 6.92, 7.2. = 5.5.7.a. = 10.83 SS(H) MSE H2 = 27 an