Question: last year and B = a cell phone user while driving. If A and B are independent then P(A B) = P(A)P(B). A B is

last year and B = a cell phone user while driving. If A and B are independent then P(A B) = P(A)P(B). A B is the event that a driver received a speeding violation last year and also used a cell phone while driving. Suppose, a study was conducted and the following data were gathered

Speeding Ticket NOT Speeding Ticket Cell

Phone User 35 18

Cell Phone NOT user 27 21

What is the Test Statistic to test the Null Hypothesis H0 : Being a cell phone user while driving and receiving a speeding violation are independent events against the alternative hypothesis Ha : Being a cell phone user while driving and receiving a speeding violation are dependent events?

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