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An engineer wants to know if the mean strengths of three different concrete mix designs differ significantly. He randomly sel
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Answer #1

From the given information,

a. It is correct answer. i.e., option C is correct.

b. Here sample size is 9 which not sufficiently large enough hence normality condition is not satisfied by sample and also population is not normally distributed.

Hence,

Option A is correct answer.

Thank you.

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