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 test of independence,the difference expected value for the "40 and over and regularly use text messaging" cell is just over 43 people.
Definitions:
Net Earnings
Take-home pay, calculated by subtracting total deductions from gross earnings.
Tax Liability
The total amount of tax that an individual or entity is legally obligated to pay to a tax authority.
Weekly Salary
The total amount of money earned by an employee for work done in a single week.
Fourth Of July
A holiday in the United States commemorating the adoption of the Declaration of Independence on July 4, 1776.
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