=+steel specimens was 6.43 and the sample mean for aluminum specimens was 7.09. Suppose that the sample

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=+steel specimens was 6.43 and the sample mean for aluminum specimens was 7.09. Suppose that the sample standard deviations were 1.08 and 1.19, respectively. Do you agree with the article’s authors that the difference in headability ratings is significant at the 5% level?

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