TABLE P6.38 Compressive Strength, MPa Cube No. With Admixture Without Admixture 1 24.2 24.4 25.1 26.0 3 25.6 25.6 4 24.1 25.1 5 23.5 24.5 2.
TABLE P6.38 Compressive Strength, MPa Cube No. With Admixture Without Admixture 1 24.2 24.4 25.1 26.0 3 25.6 25.6 4 24.1 25.1 5 23.5 24.5 2.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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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 MPa with and
without admixture are shown in Table P6.38.
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 P6.38
Compressive Strength, MPa
Cube No.
With Admixture
Without Admixture
1
24.2
24.4
25.1
26.0
3
25.6
25.6
4
24.1
25.1
5
23.5
24.5
2.
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