A fitness journal is interested in knowing whether there is a difference in percentage body fat for people who are 30 and under versus those who are over 30 years old. It is thought that the older group will have a higher average body fat percentage. A file titled BodyFat contains data for a sample of people tested at fitness centers in the St. Louis area. Using an alpha level equal to 0.05, conduct the appropriate hypothesis test. Assume equal population variances.