Aragon Equipment, Inc. is a tractor manufacturer that is beginning to realize the importance of sales data in marketing its products. Its two main products are The Incisor, a tractor used in large agricultural settings, and The Caddy, a smaller tractor primarily used in landscape. The company divides its market into four geographic regions. With the aim of maximally allocating its resources, Aragon decides to investigate whether there is a relationship between the variablestype of Aragon tractor sold ("The Incisor" or "The Caddy") andgeographic region of the sale ("Great Lakes", "Ohio Valley", "Mid-Atlantic", or "Corn Belt").
The contingency table below summarizes sales data from 500 Aragon tractor sales. Each cell of the table contains three numbers: the first number is the observed cell frequency (fO); the second number is the expected cell frequency (fE) under the assumption that there is no relationship between the type of tractor sold and the geographic region of the sale; and the third number is the following value.
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