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Is there enough evidence to refute what the manufacturer

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The Rockwell Hardness Index for Steel is determined by pressing a diamond point into the steel and measuring the depth of penetration. For 50 specimens of a steel alloy, the Rockwell hardness index averaged 62 with a standard deviation of 8. The manufacturer says this alloy has an average hardness index of at least 64. Is there enough evidence to refute what the manufacturer has said?

Reference no: EM132529514

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