I gave my class pre-and post-surveys on their perceptions of their own learning and engagement in my course. The survey had four sections: Confidence in Conservation Biology, Self Assessment of Skills, Self-efficenacy in Science, and Relationship to Conservation Biology. Each survey had 25 questions overall. Each question had five possible responses on a Likert scale ranging from Strongly Disagree to Strongly Agree.
Fifteen students completed the pre-survey. Only ten were present to complete the post survey.
Can I consider each set of the survey to be a separate study to reduce the likelihood of type-ii error, or is that not okay?
If I use a non-parametric test, does that reduce the chance of type-ii error?
Which test do you recommend I use? Is a paired test the right way to go, even though I will lose 5 data points?