A Researcher Was Interested in Stress Levels of Lecturers During

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