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Crossbill Finches Have Beaks That Overlap with the Top Beak

Question 7

Multiple Choice

Crossbill finches have beaks that overlap with the top beak to one side or the other of the lower beak. Most populations have 50:50 ratios of "right-handed" and "left-handed" beaks, and the handedness of the beaks is thought to be randomly determined, so we expect to see equal numbers of right-beak and left-beak finches. Consider a survey of 140 crossbill finches, which reveals 82 with right beaks and 58 with left beaks. What is the conclusion of a two-sided binomial test using the normal distribution to approximate the binomial?


A) Fail to reject null hypothesis, we lack evidence that the handedness of the beaks is non-random.
B) Fail to reject null hypothesis, we have evidence that the handedness of the beaks is non-random.
C) Reject null hypothesis, we lack evidence that the handedness of the beaks is non-random.
D) Reject null hypothesis, we have evidence that the handedness of the beaks is non-random.

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