Maurice Tutor

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Category > Management Posted 07 Jan 2018 My Price 5.00

percentage of impurities

A pharmaceutical manufacturer purchases raw material from two different suppliers. The mean level of impurities is approximately the same for both suppliers, but the manufacturer is concerned about the variability in the amount of impurities from shipment to shipment. If the level of impurities tends to vary excessively for one source of supply, this could affect the quality of the final product. To compare the variation in percentage impurities for the two suppliers,

the manufacturer selects ten shipments from each supplier and measures the percentage of impurities in each shipment. The sample variances were  =.273 and   =.094, respectively.  Form a 95% confidence interval for the ratio of the true population variances.

 

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Maurice Tutor
(5)
Status NEW Posted 07 Jan 2018 10:01 PM My Price 5.00

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