A cell phone company wants to determine if the use of text messaging is independent of age.The following data has been collected from a random sample of customers. 
To conduct a contingency analysis using a 0.01 level of significance,the value of the critical value is:
Definitions:
Rental Cost
The expense incurred for using a property, equipment, or other asset under a lease agreement for a specified period.
Machine Hour
A unit of measure representing the operation of a machine for one hour, often used in cost accounting to allocate expenses based on machine use.
Break-even Sales
Break-even sales is the amount of revenue required to cover both fixed and variable costs, resulting in no profit or loss.
Variable Costs
Costs that fluctuate in direct relation to production levels or sales figures.
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