Question: A study was conducted to evaluate stress levels of OSU students. A random sample of OSU undergraduate students took a stress test at the beginning of Autumn semester and then took the stress test again after final exams. Researchers have a set of questions they would like to answer. For each of the following research questions, state what type of statistical test would be most appropriate from the following choices: one-sample t-test, two-sample t-test, paired t-test . Justify your choice for each question.

1. Is there a difference in mean stress levels at the start of the semester between male and female students?
2. Are students’ mean stress levels the same at the beginning and the end of the semester?
3. Is the average stress score at the end of the semester greater than 100 (the threshold for "high stress" on this particular scale)?

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