A government agency provides the number of miles that residents of the 75 largest metropolitan areas travel per day in a car. Suppose that for a simple random sample of 50 City A residents the mean is 22.9 miles a day and the standard deviation is 8.7 miles a day, and for an independent simple random sample of 40 City B residents the mean is 18.3 miles a day and the standard deviation is 7.7 miles a day.

What is the 95% confidence interval for the difference between the two population means (in miles per day)? (Use City A City B. Round your answers to one decimal place.)