1.15 - Spurious Contexts

Question 1

Spearman’s Rank

Answer 1

Value from -1 to 1 (negative to positive correlation)

Rank has to be larger than critical value to be significant to 95% (confidence)

Question 2

Method

Answer 2

Place independent (x) and dependent (y) values in table
Rank values (average if same value)
Find difference between Rank x and Rank y and square difference
Find delta d^2 (Rx - Ry should equal 0)
Use formula: 1 - (6deltad^2)/(n^3-n)
Determine degrees of freedom (n-2) and compare to critical value
If less accept null hypothesis, if greater reject null hypothesis