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Carl wants to determine if blue eyes are more common in humans than brown eyes. He observes and records the eye color of his mother, father, two sisters, and himself. Hid data show that three people in his family have blue eyes and two have brown eyes. Based on these data, Carl concludes that blue eye color is more common in humans than brown eye color. What is the main reason you should question the value of the conclusion reached by Carl?
What is the sample size in his research was too small?