(Use the following information to answer the next six questions.)
A manufacturer is interested in selecting one of three companies to deliver (by truck) its product to its distributors and wholesalers in a certain area. Each of the companies has different operating procedures and uses different routes. Assuming that certain minimum standards for delivery time are achieved, the manufacturer wants to select the company with the lowest unit shipping cost.
In addition, the manufacturer believes that the type of packaging used for the product may have an impact on shipping cost and is considering two types of packaging. It is unknown whether or not any of the three companies under consideration is better equipped to handle either type of packaging.
After using each of the companies for five deliveries of the product with each of the types of packaging (thus, each company made a total of 10 deliveries, with all deliveries under similar circumstances), the shipping costs per unit were calculated and are shown below:

-If the mean square for error is 0.168, compute the F ratio necessary to determine whether a difference exists between the three companies with regard to unit shipping costs. (Note: take advantage of any previous calculations useful for this question.) The F ratio is
A) 8.292.
B) 2.369.
C) 0.000.
D) 199.000.
E) none of the above.

In the Following Model for the Two-Way Factorial Model, Which

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