A Wilcoxon Rank Sum Test for Comparing Two Populations Involves

question 78

Multiple Choice

A Wilcoxon rank sum test for comparing two populations involves two independent samples of sizes 15 and 20. The un-standardized test statistic (that is the rank sum) is T = 210. The value of the standardized test statistic z is:

• A) 14.0
• B) 10.5
• C) 6.0
• D) -2.0
• E) -3.2

---

Definitions:

Pharynx

The muscular tube that forms part of the digestive and respiratory systems, connecting the mouth and nasal cavity to the esophagus and larynx.

Nasal Septum

Bony partition that separates the nasal cavity into left and right parts; composed of the vomer, the perpendicular plate of the ethmoid, and hyaline cartilage.

Nasal Cavity

The nasal cavity is the large air-filled space above and behind the nose in the middle of the face, forming part of the respiratory system where air is heated, humidified, and filtered.

Auditory Tubes

The auditory tubes, also known as Eustachian tubes, are canals connecting the middle ear with the nasopharynx, equalizing pressure on either side of the eardrum.