Week 11

Question 1

pearson correlation

Answer 1

both variables on the ratio or interval scale

Question 2

spearman correlation

Answer 2

both variables on the ordinal scale (ranks)

Question 3

point biserial correlation

Answer 3

one variable on the ratio/interval scale and one dichotomous variable

Question 4

multiplying scores with a negative constant

Answer 4

produces a mirror image of the pattern and changes the sign of correlation

Question 5

outliers

Answer 5

can have a significant influence on correlation

Question 6

coefficient of determination, r^2

Answer 6

measures the proportion of variability in one variable that can be determined from a relationship with another variable
r x r = percent which the variability in one variable can be predicted from the other variable (and vice versa)

Question 7

restricted range

Answer 7

influences correlation