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Question
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.
| Regularly use text messaging | Do not regularly use text messaging | |
| Under 21 | 82 | 38 |
| 21-39 | 57 | 34 |
| 40 and over | 6 | 83 |
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.
Answer
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