Correlations - Week Three

Question 1

What does a correlational design measure?

Answer 1

Strength and relationship of a variable

Question 2

What does ‘r’ indicate

Answer 2

Measure strength of linear association
Sign r indicates direction

Question 3

three main r values and what they stand for

Answer 3

r = 1 means you can identify the other variable, high with highs, lows with lows
r= 0 means no relationship, one variable cannot help guess the other variable
r= negative means high with low (more drink = slower speed)

Question 4

Applicability of r

Answer 4

Only linear relationships are accounted for , outliers may skew results
Need to do a scatter graph to check

Question 5

Why is spearman’s rho sometimes a more appropriate measure?

Answer 5

Better to use for outliers = impact of outliers decreases