Halfway through the semester Professor Jane Austen decided to compare test scores for her five doctoral students who attended one of two courses she taught. The scores are given in the table below: Category Prose Prose Prose Poetry Poetry Scores 70 80 60 80 90 (i) What is the best method to evaluate the relationship between the two courses and test scores: (ii) What is the standard deviation of all the students in the class: (iii) What proportion of students opted to take the prose class: (iv) Compute the value of the measure that best evaluates the relationship between the two courses and test scores