Researchers wanted to compare whether a driver's speed on the highway was affected by whether the driver was a resident of the state. The speeds of cars on a stretch of Interstate 95 with a speed limit of 65 miles per hour in central Connecticut were recorded. A sample of 72 cars with Connecticut license plates had an average speed of 70.2 miles per hour. A sample of 53 cars with out-of-state license plates had an average speed of 68.6 miles per hour. Assume the population standard deviations of the speeds of cars with Connecticut license plates and the cars with out-of-state license plates are 3.4 and 4.2 miles per hour, respectively. Find the 95% confidence interval for the difference in mean speed between the cars with Conn