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.

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.
  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.

Quizplus · Accepted Answer

The expected value for the "40 and over and regularly use text messaging" cell can be calculated using the formula:

Expected value = (row total * column total) / sample size

From the given data, we can calculate the expected value as:

Expected value = (261 * 223) / 807 = 72.03

So, the difference between the observed value (115) and the expected value (72.03) is:

115 - 72.03 = 42.97

This is just under 43 people. Therefore, the statement is true.

A Cell Phone Company Wants to Determine If the Use