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:
Customer-Driven Companies
Businesses that prioritize the needs and preferences of their customers in all aspects of their operation, from product development to customer service.
Additional Value
The extra features or benefits offered by a product or service, beyond the basic functions, that can lead to increased customer satisfaction and loyalty.
Customer Satisfaction
An indicator of how well a product or service meets the expectations of its users, critical for cultivating customer loyalty.
Needs and Expectations
The basic requirements and desired levels of satisfaction that consumers seek in products and services.
Q6: It is possible to use linear regression
Q11: A recent study posed the question about
Q12: Assume that you have calculated a prediction
Q13: In a two-tailed hypothesis test for the
Q20: The logic behind the F-test for testing
Q27: From an annual time series of a
Q28: A PC company uses two suppliers for
Q30: One of the most important aspects of
Q74: If two variables are spuriously correlated, it
Q117: State University recently randomly sampled ten students