Let 1 and 2 denote true average densities for two different types of brick. Assuming normality of

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Let 1 and 2 denote true average densities for two different types of brick. Assuming normality of the two density distributions, test H0: 1  2  0 versus Ha: 1  2 0 using the following data: m  6, x

 22.73, s1  .164, n  5, y

 21.95, and s2  .240.

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