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A random sample of 61 plastic bags with an advertised breaking strength of 9.2 pounds were tested, yielding an average breaking strength of 8.9 pounds

A random sample of 61 plastic bags with an advertised breaking strength of 9.2 pounds were tested, yielding an average breaking strength of 8.9 pounds and a standard deviation of 0.55 pound. Does this experiment provide sufficient evidence (at = 1% level of significance) to conclude that the true mean breaking strength of all such plastic bags is less than the manufacturer's claim of 9.2 pounds?

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