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A materials engineer is working in a research project to evaluate the effect of one type of admixture on the A materials engineer is working in a research project to evaluate the effect of one type

A materials engineer is working in a research project to evaluate the effect of one type of admixture on the A materials engineer is working in a research project to evaluate the effect of one type

A materials engineer is working in a research project to evaluate the effect of one type of admixture on the

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 8 mortar cubes made with admixture and 8 others without admixture after 28 days of curing. The compressive strengths of cubes in psi with and without admixture are shown in Table P6.29.

Table P6.29

 

Compressive strength, psi

Cube No.

With admixture

Without admixture

1

3520

3550

2

3645

3785

3

3715

3720

4

3500

3645

5

3414

3560

6

3685

3645

7

3545

3400

8

3515

3555

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 significance of 0.10?

 
mahesh 01-Jul-2020

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