Answered: TABLE P6.40 Compressive Strength, psi…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

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 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?

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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