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Sand content of concrete on the strength of supports

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A manufacturer of concrete bridge supports is interested in determining the effect of varying the sand content of concrete on the strength of the supports. Five supports are made for each of five different amounts of sand in the concrete mix and each support tested for compression resistance. The results are as shown in Table 6.30.

(a) Perform the analysis to determine whether there is an effect due to changing the sand content.

(b) Use orthogonal polynomial contrasts to determine the nature of the relationship of sand content and strength. Draw a graph of the response versus sand amount.

1821_nature of the relationship of sand content and strength.png

Reference no: EM131853867

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