You are in the market for a new car. You want to check whether there is a significant difference between the fuel economy of mid-size domestic cars and mid-size import cars. You sample 25 domestic car makes and find an average fuel economy of 33.412 MPG with a standard deviation of 4.18 MPG. For imports, you sample 16 cars and find an average MPG of 34.884 MPG with a standard deviation of 6.124. If a 95% confidence interval is calculated to estimate the difference between the average fuel economy of domestic and import mid-size cars, what is the margin of error? Assume both population standard deviations are equal.
1) 2.023
2) 1.606
3) 3.249
4) 3.148
5) 2.706