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6. The quality control manager of Stonehead Chemicals has asked you to determine if the variance of impurities in its shipments of fertilizer is within

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6. The quality control manager of Stonehead Chemicals has asked you to determine if the variance of impurities in its shipments of fertilizer is within the established standard. These standard states that for lad-pound bags of fertilizer, the variance in the pounds of impurities cannot exceed 4. A random sample of 20 bags is obtained, and the pounds of impurities are measured for each bag. The sample variance is computed to be 6.62

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