10.41 The strength of concrete depends, to some extent, on the method used for drying.Two different drying methods showed the following results for independently tested specimens (measurements in psi):

Do the methods appear to produce concrete with different mean strengths? Use . What assumptions are necessary in order for your answer to be valid?

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Method I n = 7 X = 3.250 S = 210 Method II n = 10 X23.240 $2 S =190