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.

---

Definitions:

Directs

To command, manage, or guide through instruction or command.

Responsible

Being responsible for performing certain actions or overseeing or looking after someone as a requirement of one's position or duty.

Blur

A lack of clarity or distinctness in an image, scenario, or situation, leading to confusion or ambiguity.

Intangibles

Non-physical assets that cannot be seen, touched, or physically measured, such as intellectual property, brand names, and customer loyalty.