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This assessment covers all eleven lessons. Each question describes a situation from a thesis project; choose the best answer. Explanations appear after each answer, so the assessment is also a final review.
Optional capstone project
To put the course into practice, analyse one more question with the course data and write it up in APA style: Does sleep predict the final exam score after controlling for stress and study hours, and do male and female students differ in sleep? Use the multiple regression and independent t-test tools, check the assumptions, and write two short paragraphs as in Lesson 11. Then repeat the whole workflow with your own thesis data.
Assessment questions
Choose one answer per question, then submit. Your answers are graded on our server; the explanations appear after you submit.
Q1A study compares job satisfaction (a mean of five Likert items) between employees in three departments. The scores are roughly normal. Which test?
Q2A power analysis for an independent t-test with d = 0.5, α = .05 and power = .80 gives 64 per group. What happens if you expect d = 0.2 instead?
Q3A raw dataset contains −99 in the income column. What should you do first?
Q4A four-item scale has α = .12, and one item has a corrected item-total correlation of −.60. What is most likely?
Q5With 300 participants, Shapiro-Wilk gives p = .02, skewness is 0.3 and the Q-Q plot is nearly straight. What do you conclude?
Q6You measure anxiety in the same patients before and after therapy. Which test compares the two time points?
Q7A t-test gives t(98) = 2.10, p = .038, d = 0.42. Which statement is best?
Q8An ANOVA is significant, F(3, 236) = 2.87, p = .037, but no Tukey comparison is significant. How do you report it?
Q9In a 2 × 2 crosstab, the smallest expected count is 2.4. Which test should you use?
Q10In a regression, predictor A has B = 0.57 and predictor B has B = −5.82, measured in different units. How do you compare their strength?
Q11A logistic regression gives OR = 1.08 for study hours. What does it mean?
Q12In a mediation analysis, the bootstrap CI of the indirect effect is [1.06, 3.22] and the total effect is not significant. What do you conclude?