The average number of miles a person drives per day is 24. A researcher wishes to see if people over age 60 drive less than 24 miles per day. She selects a random sample of 49 drivers over the age of 60 and finds that the mean number of miles driven is 22.8. The population standard deviation is 3.5 miles. At α = 0.05 is there sufficient evidence that those drivers over 60 years old drive less on average than 24 miles per day?