The students in a certain class were classified by hair color and eye color. The conventions used were: Brown and black hair were considered dark, and red and blonde hair were considered light; black and brown eyes were considered dark, and blue and green eyes were considered light. They collected the data shown in Table 5.6 (Dark Hair: 28 dark eyes, 15 light eyes; Light Hair: 9 dark eyes, 23 light eyes). Are these traits independent? (See Example 5.6.)