Crossbill Finches Have Beaks That Overlap with the Top Beak

question 2

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-handed and left-handed finches. Consider a survey of 140 crossbill finches, which reveals 84 with right beaks and 56 with left beaks. What is the P-value of a two-sided binomial test using the normal distribution to approximate the binomial?

• A) 0.015
• B) 0.020
• C) 0.023
• D) 0.033

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Definitions:

Corals

Marine invertebrates in the class Anthozoa that often live in compact colonies and are renowned for constructing large, intricate calcium carbonate structures.

Hydrozoans

A diverse group of mostly marine animals from the class Hydrozoa, which includes both solitary and colonial species like the Portuguese man-of-war.

Poriferans

A phylum of aquatic invertebrate animals known as sponges, characterized by their porous bodies and lack of organized tissues and organs.

Suspension Feeders

Organisms that feed by filtering suspended particles and small organisms from water.