The table below gives beverage preferences for random samples of teens and adults. 
We are asked to test for independence between age (i.e., adult and teen) and drink preferences.With a .05 level of significance, the critical value for the test is
Definitions:
Inelastic Demand
A situation in which the demand for a product does not change much in response to price changes.
Close Substitutes
Products that serve similar functions or needs and can easily replace one another in the eyes of the consumer.
Complements
Products or services that are used together, such that the demand for one increases the demand for the other.
Current Margin
The present profit margin; the difference between the sales revenue and the cost of goods sold at the current time.
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