TABLE P6.40 Compressive Strength, psi Cube No. With Admixture Without Admixture 1 3520 3550 2 3645 3785 3715 3720 4 3500 3645 5 3414 3560 3685 3645 3545 3400 3515 3555 3. 6.
TABLE P6.40 Compressive Strength, psi Cube No. With Admixture Without Admixture 1 3520 3550 2 3645 3785 3715 3720 4 3500 3645 5 3414 3560 3685 3645 3545 3400 3515 3555 3. 6.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
A materials engineer is working in a research project to evaluate the effect of one type of admixture on the compressive strength of concrete. He tested eight mortar cubes made with admixture and eight others without admixture after 28 days of curing. The compressive strengths of cubes in psi with and without admixture are shown in Table P6.40.
Using the statistical t-test, is there a significant difference between the means
of the compressive strengths of the two cement mortars at a level of signifi-
cance of 0.10?
Transcribed Image Text:TABLE P6.40
Compressive Strength, psi
Cube No.
With Admixture
Without Admixture
1
3520
3550
2
3645
3785
3715
3720
4
3500
3645
5
3414
3560
3685
3645
3545
3400
3515
3555
3.
6.
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