A Researcher Was Interested in Stress Levels of Lecturers During

question 10

Multiple Choice

A researcher was interested in stress levels of lecturers during lectures. She took the same group of eight lecturers and measured their anxiety (out of 15) during a normal lecture and again in a lecture in which she had paid students to be disruptive and misbehave. The data were not normally distributed. Which test should she use to compare her experimental conditions?

• A) Paired t-test
• B) Mann-Whitney test
• C) Wilcoxon signed-rank test
• D) Wilcoxon rank-sum test

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Definitions:

Single-cell

Referring to organisms that consist of only one cell, such as bacteria and many types of algae.

Carrageenan

A family of linear sulfated polysaccharides that are extracted from red edible seaweeds and used in the food industry as gelling agents.

Agar

A gelatinous substance derived from seaweed, used as a medium for bacterial growth in laboratory settings.

Thickeners

Substances added to liquids to increase their viscosity without substantially modifying their other properties, often used in food processing and cosmetics.