Elongation measurements are made on 10 pieces of steel five

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Reference no: EM13607730

Elongation measurements are made on 10 pieces of steel, five of which were treated with Method A (aluminum plus calcium) and the remaining five with Method B (aluminum only). It is conjectured that the addition of calcium will improve elongations by at least 1%. The results of the measurements are (in percent)

Method A	34	27	30	26	33
Method B	28	29	25	23	30

A. Test the hypothesis sigmaA^2 = sigmaB^2 at the 5% level of significance.

B. Using the result in (a), test the hypothesis

Ho= muA-muB = 1% versus H1= muA-muB > 1%

Reference no: EM13607730

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