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A criminal justice researcher is interested in determining if out-of-state motorists tend to speed more frequently...

A criminal justice researcher is interested in determining if out-of-state motorists tend to speed more frequently than in-state motorists. After taking a sample of traffic stop data, she recorded whether the vehicle was registered in the state or not and whether or not the driver received a speeding ticket. The data are given in the table below. Calculate the lower bound of a 90% confidence interval for the difference in the proportion of in- and out-of-state drivers who received speeding tickets. Take all calculations to three decimal places.

Received Ticket Did Not Receive Ticket
In State 94 207
Out of State 136 296
Math   Statistics-And-Probability   
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Answer #1

n1 = 94+207 = 301

n2 = 136+296 = 432

Ans : -0.060

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