Question 1
Compute Pearson r for X=[1,2,3], Y=[2,4,6]; state one limitation.
Show your reasoning and explicitly state limitations. Written solutions are assessed by an instructor; the answer key is kept private.
Written problem set
Question 2
Discuss how an outlier could change r and what a scatterplot reveals.
Question 3
Identify a confounder if motivation affects both study hours and scores.
Question 4
Compare Pearson and Spearman and write a carefully bounded finding.
Scoring
Each task: concept 2, application/calculation 2, bounded interpretation 1. Not official UCL marking.
Formative self-check · 4 questions
These multiple-choice answers offer public learning feedback; the instructor's written-solution key remains private.