A Study by the Poultry Research Center Seeks to Determine

question 22

Multiple Choice

A study by the Poultry Research Center seeks to determine if diet affects the onset of egg laying in juvenile Rhode Island Red hens. In a group of 34 hens that were fed scratch grain, 12 were laying eggs at 13 weeks of age. In a second, independent group of 25 hens that were fed on layer pellets, 4 hens were laying at 13 weeks of age. The 95% confidence interval for the difference in laying proportions at 13 weeks is: ​

• A)0.19 ± 0.13
• B)0 ± 0.13
• C)8 ± 10
• D)0.16 ± 0.06
• E)0.19 ± 0.22

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Definitions:

Respiratory System

The network of organs and tissues that help you breathe, including the lungs, airways, and muscles.

Amphibian's

Vertebrates that can live both in water (using gills) and on land (using lungs), including frogs, salamanders, and newts.

Larynx

A part of the throat involved in breathing, producing sound, and protecting the trachea against food aspiration.

Voice Box

Also known as the larynx, it is an organ in the throat involved in breathing, producing sound, and protecting the trachea against food aspiration.