Refer to Table 5.5-1. It turns out that blood type is controlled by two unlinked genes. One gene determines ABO blood type, and the other determines Rh factor (+ or −). Using the probabilities presented in Table 5.5-1, determine whether the events “individual is blood type O” and “Rh factor is − are independent.

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TABLE 5.5-1 Probability that a randomly chosen American will have a given blood type. A, B, and O refer to ABO blood type, and "+""+" and "-"*" refer to Rh factor. Blood type 0+0+ 0-0- A+A+ A-A- B+B+ B-B- AB+AB+ AB-AB- Probability 0.3740.374 0.0660.066 0.3570.357 0.0630.063 0.0850.085 0.0150.015 0.0340.034 0.0060.006