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How do I calculate the test statistic Z 0 = ?

How do I calculate the test statistic Z0 = ? A survey of 3014 adults, a poll asked people whether they smoked cigarettes and whether they always wear a seat belt in a car. The below data shows the results of the survey.

Smoke                    No Seatbelt (Success) 56              Seatbelt (Failure) 449

Don't Smoke           No Seatbelt (Success) 334            Seatbelt (Failure) 2165

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