SOLVED: The strength of concrete depends, to some extent, on the method used for drying it. Two different drying methods yielded the results in the table below for independently tested specimens (measurements in psi).Method I: 12, 10, 9, L = 3250, 92 = 3240, S1 = 210, S2 = 190Find a 90% confidence interval for the difference of the two mean strengths. What assumptions are necessary to validate the interval in Part (a)?
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SOLVED: The strength of concrete depends, to some extent, on the method used for drying it. Two different drying methods yielded the results in the table below for
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