TABLE 10-7 A Buyer for a Manufacturing Plant Suspects That His Primary

TABLE 10-7
A buyer for a manufacturing plant suspects that his primary supplier of raw materials is overcharging.In order to determine if his suspicion is correct,he contacts a second supplier and asks for the prices on various identical materials.He wants to compare these prices with those of his primary supplier.The data collected is presented in the table below,with some summary statistics presented (all of these might not be necessary to answer the questions which follow) .The buyer believes that the differences are normally distributed and will use this sample to perform an appropriate test at a level of significance of 0.01.
-Moving companies are required by the government to publish a Carrier Performance Report each year.One of the descriptive statistics they must include is the annual percentage of shipments on which a $50 or greater claim for loss or damage was filed.Suppose two companies,Econo-Move and On-the-Move,each decide to estimate this figure by sampling their records,and they report the data shown in the following table. The owner of On-the-Move is hoping to use these data to show that the company is superior to Econo-Move with regard to the percentage of claims filed.Which test would be used to properly analyze the data in this experiment?

A) t test for the difference between two means
B) F test for the difference between two variances
C) Separate variance t test for the difference between two means
D) Z test for the difference between two proportions

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